Rubio will introduce Romney Thursday night at the Republican National Convention in Tampa, Fla., where Romney will officially accept the GOP nomination. 

Rubio told Stewart he thought Romney would “give a great speech.” 

Stewart asked if RNC officials told Rubio, “Hey, charisma boy, take it down a notch,” so that Rubio wouldn’t upstage Romney. Rubio responded that they just asked him to introduce the former governor and gave him 15 minutes to say whatever he wanted. 

Stewart said he’d be willing to offer Rubio some suggestions on how to fill those 15 minutes, and Rubio jokingly accepted the offer.