Rubio, whose proposal is aimed at keeping young people in the U.S. if they came to this country illegally as children, has been talking about the idea for weeks, partly to counter the GOP's reputation for tough rhetoric on immigration.
He also said he'd be a envoy to Hispanics this election season for Republicans -- but if asked, would turn down a vice-presidential spot.
But Rubio, speaking at a National Journal event about demographics, clearly had the vice-presidency on his mind.
"If in four to five years, if I do a good job as vice president—I'm sorry, as senator—I'll have the chance to do all sorts of things," he said.
He recovered handily, telling the crowd that those "all sorts of things" include the one job he says has all the power: NFL commissioner.