Deputy Secretary of State John Sullivan appears before the Senate Foreign Relations Committee for his confirmation hearing to be the new U.S. ambassador to Russia, on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. President Donald Trump's nominee faced questions about Russian election interference and the ouster of the U.S. ambassador to Ukraine at his Senate confirmation hearing. (AP Photo/J. Scott Applewhite)

Deputy Secretary of State John Sullivan appears before the Senate Foreign Relations Committee for his confirmation hearing to be the new U.S. ambassador to Russia, on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. President Donald Trump's nominee faced questions about Russian election interference and the ouster of the U.S. ambassador to Ukraine at his Senate confirmation hearing. (AP Photo/J. Scott Applewhite)

Deputy Secretary of State John Sullivan appears before the Senate Foreign Relations Committee for his confirmation hearing to be the new U.S. ambassador to Russia, on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. President Donald Trump's nominee faced questions about Russian election interference and the ouster of the U.S. ambassador to Ukraine at his Senate confirmation hearing. (AP Photo/J. Scott Applewhite)

Deputy Secretary of State John Sullivan appears before the Senate Foreign Relations Committee for his confirmation hearing to be the new U.S. ambassador to Russia, on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. President Donald Trump's nominee faced questions about Russian election interference and the ouster of the U.S. ambassador to Ukraine at his Senate confirmation hearing. (AP Photo/J. Scott Applewhite)

Deputy Secretary of State John Sullivan appears before the Senate Foreign Relations Committee for his confirmation hearing to be the new U.S. ambassador to Russia, on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. President Donald Trump's nominee faced questions about Russian election interference and the ouster of the U.S. ambassador to Ukraine at his Senate confirmation hearing. (AP Photo/J. Scott Applewhite)

Deputy Secretary of State John Sullivan appears before the Senate Foreign Relations Committee for his confirmation hearing to be the new U.S. ambassador to Russia, on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. President Donald Trump's nominee faced questions about Russian election interference and the ouster of the U.S. ambassador to Ukraine at his Senate confirmation hearing. (AP Photo/J. Scott Applewhite)

Deputy Secretary of State John Sullivan appears before the Senate Foreign Relations Committee for his confirmation hearing to be the new U.S. ambassador to Russia, on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. President Donald Trump's nominee faced questions about Russian election interference and the ouster of the U.S. ambassador to Ukraine at his Senate confirmation hearing. (AP Photo/J. Scott Applewhite)

Deputy Secretary of State John Sullivan appears before the Senate Foreign Relations Committee for his confirmation hearing to be the new U.S. ambassador to Russia, on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. President Donald Trump's nominee faced questions about Russian election interference and the ouster of the U.S. ambassador to Ukraine at his Senate confirmation hearing. (AP Photo/J. Scott Applewhite)

Deputy Secretary of State John Sullivan appears before the Senate Foreign Relations Committee for his confirmation hearing to be the new U.S. ambassador to Russia, on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. President Donald Trump's nominee faced questions about Russian election interference and the ouster of the U.S. ambassador to Ukraine at his Senate confirmation hearing. (AP Photo/J. Scott Applewhite)

Deputy Secretary of State John Sullivan appears before the Senate Foreign Relations Committee for his confirmation hearing to be the new U.S. ambassador to Russia, on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. President Donald Trump's nominee faced questions about Russian election interference and the ouster of the U.S. ambassador to Ukraine at his Senate confirmation hearing. (AP Photo/J. Scott Applewhite)

Deputy Secretary of State John Sullivan appears before the Senate Foreign Relations Committee for his confirmation hearing to be the new U.S. ambassador to Russia, on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. President Donald Trump's nominee faced questions about Russian election interference and the ouster of the U.S. ambassador to Ukraine at his Senate confirmation hearing. (AP Photo/J. Scott Applewhite)

Deputy Secretary of State John Sullivan appears before the Senate Foreign Relations Committee for his confirmation hearing to be the new U.S. ambassador to Russia, on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. President Donald Trump's nominee faced questions about Russian election interference and the ouster of the U.S. ambassador to Ukraine at his Senate confirmation hearing. (AP Photo/J. Scott Applewhite)

Deputy Secretary of State John Sullivan appears before the Senate Foreign Relations Committee for his confirmation hearing to be the new U.S. ambassador to Russia, on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. President Donald Trump's nominee faced questions about Russian election interference and the ouster of the U.S. ambassador to Ukraine at his Senate confirmation hearing. (AP Photo/J. Scott Applewhite)

Deputy Secretary of State John Sullivan appears before the Senate Foreign Relations Committee for his confirmation hearing to be the new U.S. ambassador to Russia, on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. President Donald Trump's nominee faced questions about Russian election interference and the ouster of the U.S. ambassador to Ukraine at his Senate confirmation hearing. (AP Photo/J. Scott Applewhite)

Deputy Secretary of State John Sullivan appears before the Senate Foreign Relations Committee for his confirmation hearing to be the new U.S. ambassador to Russia, on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. President Donald Trump's nominee faced questions about Russian election interference and the ouster of the U.S. ambassador to Ukraine at his Senate confirmation hearing. (AP Photo/J. Scott Applewhite)

Deputy Secretary of State John Sullivan appears before the Senate Foreign Relations Committee for his confirmation hearing to be the new U.S. ambassador to Russia, on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. President Donald Trump's nominee faced questions about Russian election interference and the ouster of the U.S. ambassador to Ukraine at his Senate confirmation hearing. (AP Photo/J. Scott Applewhite)

Rep. Gerry Connolly, D-Va., listens to a question from a reporter as he leaves a closed door meeting where Catherine Croft, a State Department adviser on Ukraine, and Deputy Assistant Secretary of Defense Laura Cooper testify as part of the House impeachment inquiry into President Donald Trump on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. (AP Photo/Andrew Harnik)

Rep. Gerry Connolly, D-Va., speaks to reporters as he leaves a closed door meeting where Catherine Croft, a State Department adviser on Ukraine, and Deputy Assistant Secretary of Defense Laura Cooper testify as part of the House impeachment inquiry into President Donald Trump on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. (AP Photo/Andrew Harnik)

Rep. Gerry Connolly, D-Va., speaks to reporters as he leaves a closed door meeting where Catherine Croft, a State Department adviser on Ukraine, and Deputy Assistant Secretary of Defense Laura Cooper testify as part of the House impeachment inquiry into President Donald Trump on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. (AP Photo/Andrew Harnik)

Sen. Bob Menendez, the top Democrat on the Senate Foreign Relations Committee, questions Deputy Secretary of State John Sullivan, President Donald Trump's nominee to become the new U.S. ambassador to Russia, on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. Menendez inquired about Trump's firing of U.S. Ambassador to Ukraine, Marie "Masha" Yovanovitch and pressuring that country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

Sen. Bob Menendez, the top Democrat on the Senate Foreign Relations Committee, questions Deputy Secretary of State John Sullivan, President Donald Trump's nominee to become the new U.S. ambassador to Russia, on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. Menendez inquired about Trump's firing of U.S. Ambassador to Ukraine, Marie "Masha" Yovanovitch and pressuring that country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

Rep. Matt Gaetz, R-Fla., speaks to reporters outside a closed door meeting where Catherine Croft, a State Department adviser on Ukraine, and Deputy Assistant Secretary of Defense Laura Cooper testify as part of the House impeachment inquiry into President Donald Trump on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. (AP Photo/Andrew Harnik)

Rep. Matt Gaetz, R-Fla., speaks to reporters outside a closed door meeting where Catherine Croft, a State Department adviser on Ukraine, and Deputy Assistant Secretary of Defense Laura Cooper testify as part of the House impeachment inquiry into President Donald Trump on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. (AP Photo/Andrew Harnik)

Rep. Matt Gaetz, R-Fla., takes a question from reporters outside a closed door meeting where Catherine Croft, a State Department adviser on Ukraine, and Deputy Assistant Secretary of Defense Laura Cooper testify as part of the House impeachment inquiry into President Donald Trump on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. (AP Photo/Andrew Harnik)

Rep. Matt Gaetz, R-Fla., speaks to reporters outside a closed door meeting where Catherine Croft, a State Department adviser on Ukraine, and Deputy Assistant Secretary of Defense Laura Cooper testify as part of the House impeachment inquiry into President Donald Trump on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. (AP Photo/Andrew Harnik)

Rep. Matt Gaetz, R-Fla., speaks to reporters outside a closed-door meeting where Catherine Croft, a State Department adviser on Ukraine, and Deputy Assistant Secretary of Defense Laura Cooper testify as part of the House impeachment inquiry into President Donald Trump on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. (AP Photo/Andrew Harnik)

House Rules Committee Chairman Jim McGovern, D-Mass., arrives for a markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

House Rules Committee Chairman Jim McGovern, D-Mass., prepares for a markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, in his office at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

House Rules Committee Chairman Jim McGovern, D-Mass., prepares for a markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, in his office at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

House Rules Committee Chairman Jim McGovern, D-Mass., prepares for a markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, in his office at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

Catherine Croft, a State Department adviser on Ukraine, departs a secure area of the Capitol after a closed door meeting where she testified as part of the House impeachment inquiry into President Donald Trump, Wednesday, Oct. 30, 2019, on Capitol Hill in Washington. (AP Photo/Patrick Semansky)

Catherine Croft, a State Department adviser on Ukraine, third from right, leaves after testifying at a closed door meeting as part of the House impeachment inquiry into President Donald Trump on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. (AP Photo/Andrew Harnik)

Catherine Croft, a State Department adviser on Ukraine, departs a secure area of the Capitol after a closed door meeting where she testified as part of the House impeachment inquiry into President Donald Trump, Wednesday, Oct. 30, 2019, on Capitol Hill in Washington. (AP Photo/Patrick Semansky)

Catherine Croft, a State Department adviser on Ukraine, leaves after testifying at a closed door meeting as part of the House impeachment inquiry into President Donald Trump on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. (AP Photo/Andrew Harnik)

Catherine Croft, a State Department adviser on Ukraine, leaves after testifying at a closed door meeting as part of the House impeachment inquiry into President Donald Trump on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. (AP Photo/Andrew Harnik)

Catherine Croft, a State Department adviser on Ukraine, leaves after testifying at a closed door meeting as part of the House impeachment inquiry into President Donald Trump on Capitol Hill in Washington, Wednesday, Oct. 30, 2019. (AP Photo/Andrew Harnik)

House Rules Committee Chairman Jim McGovern, D-Mass., joined from left by Rep. Rob Woodall, R-Ga., and Rep. Tom Cole, R-Okla., holds a markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, in his office at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

House Rules Committee Chairman Jim McGovern, D-Mass., listens to rebuttal from Rep. Tom Cole, R-Okla.,left, during a markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, in his office at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

Rep. Rob Woodall, R-Ga., joined at left by Rep. Michael Burgess, R-Texas, objects to the resolution put forth by House Rules Committee Chairman Jim McGovern, D-Mass., at a markup that will formalize the next steps in the impeachment inquiry of President Donald Trump, in his office at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

House Rules Committee Chairman Jim McGovern, D-Mass., presides over a markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

House Rules Committee Chairman Jim McGovern, D-Mass., left, joined by Rep. Alcee Hastings, D-Fla., presides over a markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

House Rules Committee Chairman Jim McGovern, D-Mass., joined at left by Rep. Tom Cole, R-Okla., presides over a markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

House Rules Committee Chairman Jim McGovern, D-Mass., presides over a markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

Rep. Rob Woodall, R-Ga., a member of the House Rules Committee, argues a point during a markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

House Rules Committee member Rep. Tom Cole, R-Okla., joined at left by Rep. Rob Woodall, R-Ga., argue a point during the markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

House Rules Committee Chairman Jim McGovern, D-Mass., presides over a markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

Rep. Rob Woodall, R-Ga., a member of the House Rules Committee, argues a point during a markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

Rep. Jamie Raskin, D-Md., left, and Rep. Mary Gay Scanlon, D-Pa., argue a point as the House Rules Committee holds a markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

House Rules Committee Ranking Member Rep. Tom Cole, R-Okla., joined at left by Rep. Rob Woodall, R-Ga., argue a point during the markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

House Rules Committee members Rep. Ed Perlmutter, D-Colo., and Rep. Jamie Raskin, D-Md., right, work on the markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

House Rules Committee member Rep. Norma Torres, D-Calif., argues a point as the panels holds a markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

Rep. Jamie Raskin, D-Md., left, and Rep. Mary Gay Scanlon, D-Pa., argue a point as the House Rules Committee holds a markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

Rep. Rob Woodall, R-Ga., a member of the House Rules Committee, joined at left by Rep. Michael Burgess, R-Texas, argues a point during a markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

House Rules Committee Chairman Jim McGovern, D-Mass., presides over a markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

House Rules Committee Chairman Jim McGovern, D-Mass., presides over a markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

House Rules Committee Chairman Jim McGovern, D-Mass., joined from left by Rep. Rob Woodall, R-Ga., and Rep. Tom Cole, R-Okla., presides over a markup of the resolution that will formalize the next steps in the impeachment inquiry of President Donald Trump, at the Capitol in Washington, Wednesday, Oct. 30, 2019. Democrats have been investigating Trump's withholding of military aid to Ukraine as he pushed the country's new president to investigate Democrats and the family of rival presidential contender Joe Biden. (AP Photo/J. Scott Applewhite)

Christopher Anderson, a State Department employee arrives for a closed-door deposition at the US Capitol in Washington, DC on October 30, 2019. - US President Trump is accused by Democrats of withholding military aid to compel Ukraine to mount an embarrassing corruption probe against Biden -- in other words using US foreign policy for his personal political benefit.Trump dismisses the case as cooked up, but Congressional investigators have heard a steady flow of damaging evidence.After interviewing 10 witnesses behind closed doors over the past five weeks, Democrats have drawn up rules for the next stage of the impeachment inquiry that will include public hearings.The White House dismissed the process October 29, 2019 as a "sham," claiming that the Democrats were refusing its basic due process rights. The House vote could take place before or shortly after the New Year. (Photo by Olivier Douliery / AFP)

Christopher Anderson, a State Department employee arrives for a closed-door deposition at the US Capitol in Washington, DC on October 30, 2019. - US President Trump is accused by Democrats of withholding military aid to compel Ukraine to mount an embarrassing corruption probe against Biden -- in other words using US foreign policy for his personal political benefit.Trump dismisses the case as cooked up, but Congressional investigators have heard a steady flow of damaging evidence.After interviewing 10 witnesses behind closed doors over the past five weeks, Democrats have drawn up rules for the next stage of the impeachment inquiry that will include public hearings.The White House dismissed the process October 29, 2019 as a "sham," claiming that the Democrats were refusing its basic due process rights. The House vote could take place before or shortly after the New Year. (Photo by Olivier Douliery / AFP)

Christopher Anderson, a State Department employee arrives for a closed-door deposition at the US Capitol in Washington, DC on October 30, 2019. - US President Trump is accused by Democrats of withholding military aid to compel Ukraine to mount an embarrassing corruption probe against Biden -- in other words using US foreign policy for his personal political benefit.Trump dismisses the case as cooked up, but Congressional investigators have heard a steady flow of damaging evidence.After interviewing 10 witnesses behind closed doors over the past five weeks, Democrats have drawn up rules for the next stage of the impeachment inquiry that will include public hearings.The White House dismissed the process October 29, 2019 as a "sham," claiming that the Democrats were refusing its basic due process rights. The House vote could take place before or shortly after the New Year. (Photo by Olivier Douliery / AFP)

Christopher Anderson, a State Department employee arrives for a closed-door deposition at the US Capitol in Washington, DC on October 30, 2019. - US President Trump is accused by Democrats of withholding military aid to compel Ukraine to mount an embarrassing corruption probe against Biden -- in other words using US foreign policy for his personal political benefit.Trump dismisses the case as cooked up, but Congressional investigators have heard a steady flow of damaging evidence.After interviewing 10 witnesses behind closed doors over the past five weeks, Democrats have drawn up rules for the next stage of the impeachment inquiry that will include public hearings.The White House dismissed the process October 29, 2019 as a "sham," claiming that the Democrats were refusing its basic due process rights. The House vote could take place before or shortly after the New Year. (Photo by Olivier Douliery / AFP)

Christopher Anderson, a State Department employee arrives for a closed-door deposition at the US Capitol in Washington, DC on October 30, 2019. - US President Trump is accused by Democrats of withholding military aid to compel Ukraine to mount an embarrassing corruption probe against Biden -- in other words using US foreign policy for his personal political benefit.Trump dismisses the case as cooked up, but Congressional investigators have heard a steady flow of damaging evidence.After interviewing 10 witnesses behind closed doors over the past five weeks, Democrats have drawn up rules for the next stage of the impeachment inquiry that will include public hearings.The White House dismissed the process October 29, 2019 as a "sham," claiming that the Democrats were refusing its basic due process rights. The House vote could take place before or shortly after the New Year. (Photo by MANDEL NGAN / AFP)

Christopher Anderson (C), a State Department employee arrives for a closed-door deposition at the US Capitol in Washington, DC on October 30, 2019. - US President Trump is accused by Democrats of withholding military aid to compel Ukraine to mount an embarrassing corruption probe against Biden -- in other words using US foreign policy for his personal political benefit.Trump dismisses the case as cooked up, but Congressional investigators have heard a steady flow of damaging evidence.After interviewing 10 witnesses behind closed doors over the past five weeks, Democrats have drawn up rules for the next stage of the impeachment inquiry that will include public hearings.The White House dismissed the process October 29, 2019 as a "sham," claiming that the Democrats were refusing its basic due process rights. The House vote could take place before or shortly after the New Year. (Photo by MANDEL NGAN / AFP)

Christopher Anderson, a State Department employee arrives for a closed-door deposition at the US Capitol in Washington, DC on October 30, 2019. - US President Trump is accused by Democrats of withholding military aid to compel Ukraine to mount an embarrassing corruption probe against Biden -- in other words using US foreign policy for his personal political benefit.Trump dismisses the case as cooked up, but Congressional investigators have heard a steady flow of damaging evidence.After interviewing 10 witnesses behind closed doors over the past five weeks, Democrats have drawn up rules for the next stage of the impeachment inquiry that will include public hearings.The White House dismissed the process October 29, 2019 as a "sham," claiming that the Democrats were refusing its basic due process rights. The House vote could take place before or shortly after the New Year. (Photo by Olivier Douliery / AFP)

Christopher Anderson, a State Department employee arrives for a closed-door deposition at the US Capitol in Washington, DC on October 30, 2019. - US President Trump is accused by Democrats of withholding military aid to compel Ukraine to mount an embarrassing corruption probe against Biden -- in other words using US foreign policy for his personal political benefit.Trump dismisses the case as cooked up, but Congressional investigators have heard a steady flow of damaging evidence.After interviewing 10 witnesses behind closed doors over the past five weeks, Democrats have drawn up rules for the next stage of the impeachment inquiry that will include public hearings.The White House dismissed the process October 29, 2019 as a "sham," claiming that the Democrats were refusing its basic due process rights. The House vote could take place before or shortly after the New Year. (Photo by Olivier Douliery / AFP)

Christopher Anderson, a State Department employee arrives for a closed-door deposition at the US Capitol in Washington, DC on October 30, 2019. - US President Trump is accused by Democrats of withholding military aid to compel Ukraine to mount an embarrassing corruption probe against Biden -- in other words using US foreign policy for his personal political benefit.Trump dismisses the case as cooked up, but Congressional investigators have heard a steady flow of damaging evidence.After interviewing 10 witnesses behind closed doors over the past five weeks, Democrats have drawn up rules for the next stage of the impeachment inquiry that will include public hearings.The White House dismissed the process October 29, 2019 as a "sham," claiming that the Democrats were refusing its basic due process rights. The House vote could take place before or shortly after the New Year. (Photo by Olivier Douliery / AFP)

Christopher Anderson (R), a State Department employee arrives for a closed-door deposition at the US Capitol in Washington, DC on October 30, 2019. - US President Trump is accused by Democrats of withholding military aid to compel Ukraine to mount an embarrassing corruption probe against Biden -- in other words using US foreign policy for his personal political benefit.Trump dismisses the case as cooked up, but Congressional investigators have heard a steady flow of damaging evidence.After interviewing 10 witnesses behind closed doors over the past five weeks, Democrats have drawn up rules for the next stage of the impeachment inquiry that will include public hearings.The White House dismissed the process October 29, 2019 as a "sham," claiming that the Democrats were refusing its basic due process rights. The House vote could take place before or shortly after the New Year. (Photo by MANDEL NGAN / AFP)

Christopher Anderson, a State Department employee arrives for a closed-door deposition at the US Capitol in Washington, DC on October 30, 2019. - US President Trump is accused by Democrats of withholding military aid to compel Ukraine to mount an embarrassing corruption probe against Biden -- in other words using US foreign policy for his personal political benefit.Trump dismisses the case as cooked up, but Congressional investigators have heard a steady flow of damaging evidence.After interviewing 10 witnesses behind closed doors over the past five weeks, Democrats have drawn up rules for the next stage of the impeachment inquiry that will include public hearings.The White House dismissed the process October 29, 2019 as a "sham," claiming that the Democrats were refusing its basic due process rights. The House vote could take place before or shortly after the New Year. (Photo by MANDEL NGAN / AFP)

Christopher Anderson(C), a State Department employee arrives for a closed-door deposition at the US Capitol in Washington, DC on October 30, 2019. - US President Trump is accused by Democrats of withholding military aid to compel Ukraine to mount an embarrassing corruption probe against Biden -- in other words using US foreign policy for his personal political benefit.Trump dismisses the case as cooked up, but Congressional investigators have heard a steady flow of damaging evidence.After interviewing 10 witnesses behind closed doors over the past five weeks, Democrats have drawn up rules for the next stage of the impeachment inquiry that will include public hearings.The White House dismissed the process October 29, 2019 as a "sham," claiming that the Democrats were refusing its basic due process rights. The House vote could take place before or shortly after the New Year. (Photo by Olivier Douliery / AFP)

Catherine Croft, a specialist on Ukraine with the State Department leaves after a closed-door deposition at the US Capitol in Washington, DC on October 30, 2019. - US President Trump is accused by Democrats of withholding military aid to compel Ukraine to mount an embarrassing corruption probe against Biden -- in other words using US foreign policy for his personal political benefit.Trump dismisses the case as cooked up, but Congressional investigators have heard a steady flow of damaging evidence.After interviewing 10 witnesses behind closed doors over the past five weeks, Democrats have drawn up rules for the next stage of the impeachment inquiry that will include public hearings.The White House dismissed the process October 29, 2019 as a "sham," claiming that the Democrats were refusing its basic due process rights. The House vote could take place before or shortly after the New Year. (Photo by MANDEL NGAN / AFP)

Christopher Anderson (C), a State Department employee arrives for a closed-door deposition as another witness Catherine Croft (R), a specialist on Ukraine with the State Department leaves at the US Capitol in Washington, DC on October 30, 2019. - US President Trump is accused by Democrats of withholding military aid to compel Ukraine to mount an embarrassing corruption probe against Biden -- in other words using US foreign policy for his personal political benefit.Trump dismisses the case as cooked up, but Congressional investigators have heard a steady flow of damaging evidence.After interviewing 10 witnesses behind closed doors over the past five weeks, Democrats have drawn up rules for the next stage of the impeachment inquiry that will include public hearings.The White House dismissed the process October 29, 2019 as a "sham," claiming that the Democrats were refusing its basic due process rights. The House vote could take place before or shortly after the New Year. (Photo by Olivier Douliery / AFP)

Catherine Croft (L), a specialist on Ukraine with the State Department leaves after a closed-door deposition at the US Capitol in Washington, DC on October 30, 2019. - US President Trump is accused by Democrats of withholding military aid to compel Ukraine to mount an embarrassing corruption probe against Biden -- in other words using US foreign policy for his personal political benefit.Trump dismisses the case as cooked up, but Congressional investigators have heard a steady flow of damaging evidence.After interviewing 10 witnesses behind closed doors over the past five weeks, Democrats have drawn up rules for the next stage of the impeachment inquiry that will include public hearings.The White House dismissed the process October 29, 2019 as a "sham," claiming that the Democrats were refusing its basic due process rights. The House vote could take place before or shortly after the New Year. (Photo by MANDEL NGAN / AFP)

Catherine Croft (L), a specialist on Ukraine with the State Department leaves after a closed-door deposition at the US Capitol in Washington, DC on October 30, 2019. - US President Trump is accused by Democrats of withholding military aid to compel Ukraine to mount an embarrassing corruption probe against Biden -- in other words using US foreign policy for his personal political benefit.Trump dismisses the case as cooked up, but Congressional investigators have heard a steady flow of damaging evidence.After interviewing 10 witnesses behind closed doors over the past five weeks, Democrats have drawn up rules for the next stage of the impeachment inquiry that will include public hearings.The White House dismissed the process October 29, 2019 as a "sham," claiming that the Democrats were refusing its basic due process rights. The House vote could take place before or shortly after the New Year. (Photo by MANDEL NGAN / AFP)

Christopher Anderson (R), a State Department employee arrives for a closed-door deposition at the US Capitol in Washington, DC on October 30, 2019. - US President Trump is accused by Democrats of withholding military aid to compel Ukraine to mount an embarrassing corruption probe against Biden -- in other words using US foreign policy for his personal political benefit.Trump dismisses the case as cooked up, but Congressional investigators have heard a steady flow of damaging evidence.After interviewing 10 witnesses behind closed doors over the past five weeks, Democrats have drawn up rules for the next stage of the impeachment inquiry that will include public hearings.The White House dismissed the process October 29, 2019 as a "sham," claiming that the Democrats were refusing its basic due process rights. The House vote could take place before or shortly after the New Year. (Photo by MANDEL NGAN / AFP)

Christopher Anderson (L), a State Department employee arrives for a closed-door deposition at the US Capitol in Washington, DC on October 30, 2019. - US President Trump is accused by Democrats of withholding military aid to compel Ukraine to mount an embarrassing corruption probe against Biden -- in other words using US foreign policy for his personal political benefit.Trump dismisses the case as cooked up, but Congressional investigators have heard a steady flow of damaging evidence.After interviewing 10 witnesses behind closed doors over the past five weeks, Democrats have drawn up rules for the next stage of the impeachment inquiry that will include public hearings.The White House dismissed the process October 29, 2019 as a "sham," claiming that the Democrats were refusing its basic due process rights. The House vote could take place before or shortly after the New Year. (Photo by MANDEL NGAN / AFP)

United States Representative Matt Gaetz (Republican of Florida) speaks outside of the closed-door deposition of Foreign Service Officer and Ukraine expert Catherine Croft at the U.S. Capitol in Washington D.C., U.S., on Wednesday, October 30, 2019. Credit: Stefani Reynolds / CNP | usage worldwide

United States Representative Matt Gaetz (Republican of Florida) speaks outside of the closed-door deposition of Foreign Service Officer and Ukraine expert Catherine Croft at the U.S. Capitol in Washington D.C., U.S., on Wednesday, October 30, 2019. Credit: Stefani Reynolds / CNP | usage worldwide

United States Representative Matt Gaetz (Republican of Florida) speaks outside of the closed-door deposition of Foreign Service Officer and Ukraine expert Catherine Croft at the U.S. Capitol in Washington D.C., U.S., on Wednesday, October 30, 2019. Credit: Stefani Reynolds / CNP | usage worldwide

United States Representative Matt Gaetz (Republican of Florida) speaks outside of the closed-door deposition of Foreign Service Officer and Ukraine expert Catherine Croft at the U.S. Capitol in Washington D.C., U.S., on Wednesday, October 30, 2019. Credit: Stefani Reynolds / CNP | usage worldwide

United States Representative Matt Gaetz (Republican of Florida) speaks outside of the closed-door deposition of Foreign Service Officer and Ukraine expert Catherine Croft at the U.S. Capitol in Washington D.C., U.S., on Wednesday, October 30, 2019. Credit: Stefani Reynolds / CNP | usage worldwide

United States Representative Matt Gaetz (Republican of Florida) speaks outside of the closed-door deposition of Foreign Service Officer and Ukraine expert Catherine Croft at the U.S. Capitol in Washington D.C., U.S., on Wednesday, October 30, 2019. Credit: Stefani Reynolds / CNP | usage worldwide

United States Representative Matt Gaetz (Republican of Florida) speaks outside of the closed-door deposition of Foreign Service Officer and Ukraine expert Catherine Croft at the U.S. Capitol in Washington D.C., U.S., on Wednesday, October 30, 2019. Credit: Stefani Reynolds / CNP | usage worldwide

United States Representative Matt Gaetz (Republican of Florida) speaks outside of the closed-door deposition of Foreign Service Officer and Ukraine expert Catherine Croft at the U.S. Capitol in Washington D.C., U.S., on Wednesday, October 30, 2019. Credit: Stefani Reynolds / CNP | usage worldwide

(FILES) In this file photo taken on March 16, 2018 US Deputy Secretary of State John Sullivan speaks to the press prior to talks with South Korean Foreign Minister Kang Kyung-wha at the State Department in Washington, DC. - The State Department's number two official said on October 30, 2019 he knew of a campaign by President Donald Trump's personal lawyer Rudy Giuliani against the US ambassador in Ukraine, a key part of the impeachment inquiry.Deputy Secretary of State John Sullivan faced rare open questions from lawmakers as a Senate committee considered his nomination by Trump to be ambassador to Russia. (Photo by NICHOLAS KAMM / AFP)