The visit comes just weeks after Venezuelan President Nicolás Maduro was seized in Caracas by US forces. But Trump declined to endorse Machado, whose movement claimed victory in 2024's widely contested elections, as its new leader.
The US instead backed Delcy Rodríguez, Maduro's former vice-president.
Machado said last week she hoped to thank Trump personally for the action against Maduro and would like to give the Nobel Prize to him. Trump called it "a great honour", but the Nobel Committee later clarified that it was not transferable.
