Later in the evening, a surprise speaker will take the stage in support of Mitt Romney and Paul RyanPaul Davis RyanYou just can't keep good health policy down Trump blasts Congress for sending him omnibus bill that 'nobody read' Students bash Congress for inaction on gun control MORE — there is heavy speculation that the speaker will be actor, director and former Carmel, Calif., mayor Clint Eastwood, but the GOP had not confirmed that as of early Thursday morning.

Finally, Sen. Marco RubioMarco Antonio RubioRubio: 'Hyperventilating' about Bolton unfounded George Clooney writes Parkland students: 'You make me proud of my country again' Biden praises Parkland students fighting for gun reform: ‘They’re going to win’ MORE (Fla.), who was seen as a potential running mate for Romney, will introduce the presumed nominee, who will officially accept the nomination and close out the convention.