Andrii Khilko, a lawyer and an election observer on behalf of the Ukrainian Shareholders Association, speaks in a court room during a hearing for a suit demanding that Volodymyr Zelenskiy's registration as a presidential candidate be cancelled, in Kiev, Ukraine, Saturday, April 20, 2019. The suit, filed by the head of an organization that conducts election observation, claims that Zelenskiy committed bribery by offering tickets to the Friday debate. (AP Photo/Sergei Grits)

Andrii Khilko, a lawyer and an election observer on behalf of the Ukrainian Shareholders Association, speaks in a court room during a hearing for a suit demanding that Volodymyr Zelenskiy's registration as a presidential candidate be cancelled, in Kiev, Ukraine, Saturday, April 20, 2019. The suit, filed by the head of an organization that conducts election observation, claims that Zelenskiy committed bribery by offering tickets to the Friday debate. (AP Photo/Sergei Grits)

Andrii Khilko, a lawyer and an election observer on behalf of the Ukrainian Shareholders Association, speaks in a court room during a hearing for a suit demanding that Volodymyr Zelenskiy's registration as a presidential candidate be cancelled, in Kiev, Ukraine, Saturday, April 20, 2019. The suit, filed by the head of an organization that conducts election observation, claims that Zelenskiy committed bribery by offering tickets to the Friday debate. (AP Photo/Sergei Grits)

Andrii Khilko, a lawyer and an election observer on behalf of the Ukrainian Shareholders Association, left, and Sergii Ionushas, Volodymyr Zelenskiy's lawyer, show documents to judges during a hearing a suit demanding that Zelenskiy's registration as a candidate be cancelled in Kiev, Ukraine, Saturday, April 20, 2019. The suit, filed by the head of an organization that conducts election observation, claims that Zelenskiy committed bribery by offering tickets to the Friday debate. (AP Photo/Vadim Ghirda)