Sen. Marco RubioMarco Antonio RubioSanders: 'Unfair to simply say everything is bad' in Cuba under Castro Democrats: It's Trump's world, and we're just living in it Cheese, wine importers reeling from Trump trade fight MORE (R-Fla.) doesn't think any of the candidates in the Republican presidential field should be pushed to drop out of the race.

Speaking in an interview with the Tampa Bay Times on Wednesday, Rubio, seen as a possible vice presidential candidate, rejected the idea that Newt Gingrich or any other candidate should drop out of the race.

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"I don't think anybody should be told to drop out," Rubio said. "I think people should run until they feel that either they don't want to continue or they don't see a path to victory. I've never been a believer in asking people to drop out of a race, because I had a bunch of people ask me to drop out of a race."

After winning six of the 10 states up for grabs on Super Tuesday, GOP front-runner Mitt Romney’s campaign released a memo Wednesday that said none of the other Republican candidates could catch him in the race for delegates. The memo said the other candidates were only helping President Obama by staying in the race.

Separately, a pro-Rick Santorum super-PAC called for Gingrich to drop out of the race and back the former Pennsylvania senator.



"Based on his electoral performance last night and his out-of-step record, it is time for Newt Gingrich to exit the Republican nominating process," Stuart Roy, a spokesman for the super-PAC, said in a statement on Wednesday.

Gingrich and Santorum both believe they’d have a better shot of defeating Romney in a one-on-one match-up.

While Santorum's campaign itself hasn't called for Gingrich to drop out, it has said it would benefit from the former House Speaker's support.

On Monday, Santorum said his campaign would be in a "very, very good place to win the nomination," as the field dwindled down to fewer candidates.

But Santorum suggested it was ridiculous for Romney to pressure candidates to leave the race.

Gingrich also has resisted calls to drop out.

"We are staying in this race because I believe it is going to be impossible for a moderate to win the general election," Gingrich said at a campaign event in Alabama, according to the Atlanta Journal-Constitution.

Rubio said he was not worried that a clear Republican presidential nominee had yet to emerge.