Later in the evening, a surprise speaker will take the stage in support of Mitt Romney and Paul RyanPaul RyanThe Hill's 12:30 Report Ryan defends Priebus, says he's doing 'fantastic job' Pence raises million for PAC at fundraiser: report 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 RubioMexican politicians have a new piñata: Donald Trump Bush ethics lawyer: Congress must tell Trump not to fire Mueller The private alternative to the National Flood Insurance Program  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.