Republican presidential candidate Marco RubioMarco RubioWar over the estate tax returns Clinton’s strategy: Get under Trump’s skin Rubio, Heck help out at car crash scene MORE refused to say on Sunday whether rivals John Kasich or Ben Carson should drop out of the race, but said he thinks the party will be more successful when it coalesces behind one candidate.
"I believe that the sooner we can coalesce, the better we're going to be as a party in general," he said on "Fox News Sunday."
"It's going to happen one way or another. There's a natural process that's going to take hold."
Rubio said the other candidates in the race have been in it for a long time and have been working hard, adding that they have the right to decide their futures themselves.
Rubio said he thinks the question is the timing. Kasich is going to focus "entirely" on Michigan, Rubio said, while his campaign will continue to work all across the country. Rubio added that he's hitting three different states on Sunday.
"We're going to compete everywhere. We feel good about that coalescing happening in all those places where these other candidates are not."
Rubio came in second place in the South Carolina Republican primary on Saturday, edging out Ted CruzTed CruzThe 'Overton Window' and how Trump won the nomination with it Judge rejects attempt to stop internet oversight transfer Tech groups file court brief opposing internet transition suit MORE by a very narrow margin. Rival Donald TrumpDonald TrumpRestive GOP freshmen eye entitlement reform What will be October’s surprise? Poll: Half of Trump supporters don't trust integrity of election MORE won the primary. During his speech Saturday night, Rubio said Republicans now have a three-person race.