Pro independence demonstrators are removed by Catalan police officers, during a sit-down protest outside the Barcelona office of the state prosecutor, in Barcelona, Spain, Tuesday, Feb. 12, 2019. A sensitive trial against a dozen Catalan separatist politicians and activists got underway Tuesday in Spain's Supreme Court amid protests by pro-independence supporters and a highly volatile political environment. (AP Photo/Daniel Cole)

Pro independence demonstrators are removed by Catalan police officers, during a sit-down protest outside the Barcelona office of the state prosecutor, in Barcelona, Spain, Tuesday, Feb. 12, 2019. A sensitive trial against a dozen Catalan separatist politicians and activists got underway Tuesday in Spain's Supreme Court amid protests by pro-independence supporters and a highly volatile political environment. (AP Photo/Daniel Cole)

Pro independence demonstrators block a road, during a sit-down protest outside the Barcelona office of the state prosecutor, in Barcelona, Spain, Tuesday, Feb. 12, 2019. A sensitive trial against a dozen Catalan separatist politicians and activists got underway Tuesday in Spain's Supreme Court amid protests by pro-independence supporters and a highly volatile political environment. (AP Photo/Daniel Cole)

Pro independence demonstrators block a road, during a sit-down protest outside the Barcelona office of the state prosecutor, in Barcelona, Spain, Tuesday, Feb. 12, 2019. A sensitive trial against a dozen Catalan separatist politicians and activists got underway Tuesday in Spain's Supreme Court amid protests by pro-independence supporters and a highly volatile political environment. (AP Photo/Daniel Cole)

Pro independence demonstrators gather during a protest in Catalonia square in Barcelona, Spain, Tuesday, Feb. 12, 2019. A sensitive trial against a dozen Catalan separatist politicians and activists got underway Tuesday in Spain's Supreme Court amid protests by pro-independence supporters and a highly volatile political environment. Banner in Catalan reads "freedom politics imprisoned". (AP Photo/Emilio Morenatti)

Pro independence demonstrators shout slogans during a protest in Catalonia square in Barcelona, Spain, Tuesday, Feb. 12, 2019. A sensitive trial against a dozen Catalan separatist politicians and activists got underway Tuesday in Spain's Supreme Court amid protests by pro-independence supporters and a highly volatile political environment. (AP Photo/Emilio Morenatti)

Pro independence demonstrators gather during a protest in Catalonia square in Barcelona, Spain, Tuesday, Feb. 12, 2019. A sensitive trial against a dozen Catalan separatist politicians and activists got underway Tuesday in Spain's Supreme Court amid protests by pro-independence supporters and a highly volatile political environment. Banner in Catalan reads "freedom politics imprisoned". (AP Photo/Emilio Morenatti)

Pro independence demonstrators hold estelada or independence flags during a protest in Catalonia square in Barcelona, Spain, Tuesday, Feb. 12, 2019. A sensitive trial against a dozen Catalan separatist politicians and activists got underway Tuesday in Spain's Supreme Court amid protests by pro-independence supporters and a highly volatile political environment. Banner in Catalan reads "freedom politics imprisoned". (AP Photo/Emilio Morenatti)

Pro independence demonstrators sign the national anthem during a protest in Catalonia square in Barcelona, Spain, Tuesday, Feb. 12, 2019. A sensitive trial against a dozen Catalan separatist politicians and activists got underway Tuesday in Spain's Supreme Court amid protests by pro-independence supporters and a highly volatile political environment. Banner in Catalan reads "freedom politics imprisoned". (AP Photo/Emilio Morenatti)

Pro independence demonstrators gather during a protest in Catalonia square in Barcelona, Spain, Tuesday, Feb. 12, 2019. A sensitive trial against a dozen Catalan separatist politicians and activists got underway Tuesday in Spain's Supreme Court amid protests by pro-independence supporters and a highly volatile political environment. (AP Photo/Emilio Morenatti)

Pro independence demonstrators gather during a protest in Catalonia square in Barcelona, Spain, Tuesday, Feb. 12, 2019. A sensitive trial against a dozen Catalan separatist politicians and activists got underway Tuesday in Spain's Supreme Court amid protests by pro-independence supporters and a highly volatile political environment. (AP Photo/Daniel Cole)

Pro independence demonstrators gather during a protest in Catalonia square in Barcelona, Spain, Tuesday, Feb. 12, 2019. A sensitive trial against a dozen Catalan separatist politicians and activists got underway Tuesday in Spain's Supreme Court amid protests by pro-independence supporters and a highly volatile political environment. (AP Photo/Daniel Cole)