Tension mounted in Venezuela Monday ahead of strongman Nicolas Maduro’s swearing-in ceremony, with Caracas vowing to arrest exiled opposition figure Edmundo Gonzalez Urrutia if he returns to the country.

The threat of detention came as Gonzalez Urrutia, on an international tour seeking to increase pressure on Maduro to relinquish power, was set to meet with US President Joe Biden on Monday in Washington.

The Venezuelan opposition has released a large set of polling station data it says proves their candidate overwhelmingly won presidential elections last July which the loyalist electoral council awarded to Maduro without releasing a detailed vote breakdown.

The United States, G7 countries, and several Latin American nations have rejected Maduro’s victory claim and recognized Gonzalez Urrutia as Venezuela’s legitimate president-elect.

The 75-year-old former diplomat, who found exile in Spain after the vote, has vowed to return home to take power on January 10, when Maduro is set to be sworn in for a third, six-year term at the helm of the Caribbean country.

But on Monday, Interior Minister Diosdado Cabello vowed the opposition figure “will be arrested and tried if he sets foot in Venezuela.”

During his tour, which has taken him to Argentina and Montevideo in recent days, Gonzalez Urrutia called Sunday for the Venezuelan military to recognize him as commander-in-chief as per “the sovereign will of the Venezuelan people.”

But that call was “categorically” rejected Monday in a statement read on TV by Defense Minister Vladimir Padrino, who reiterated the armed forces’ “loyalty, obedience and subordination” to Maduro.