Sen. Marco RubioMarco RubioWhat’s with Trump’s spelling mistakes? Boeing must be stopped from doing business with Iran Top Trump officials push border wall as government shutdown looms MORE (R-Fla.) on Friday reiterated that he would vote for Donald TrumpDonald TrumpPelosi gives Trump an incomplete for first 100 days Poll: More say Trump will increase their taxes Warren to Trump: The Constitution applies to you, too MORE in a general presidential election but said he hopes that scenario never comes to pass.

“For me, I’m never voting for Donald Trump in the Republican primary,” he said on “Kentucky Sports Radio." "I’m going to vote for the nominee, but it’s not going to be Donald Trump.

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“I can’t even imagine that, and I don’t even want to imagine that right now, to be honest with you. I don’t believe it’s ever going to happen. It’s one of those bridges you hope you never have to cross.”

Rubio argued that debate over whether Trump is fit to be Republican standard-bearer shows how unsuited the billionaire is for the position.

“If it was anybody else in first place right now, we would not be asked that question,” he said when asked if he would support his GOP presidential primary rival in any fashion.

“You don’t see Bernie SandersBernie SandersOvernight Energy: Trump orders review of national monuments, claiming ‘egregious abuse’ Dem rep: Trump's tax plan as believable as 'magic, unicorns or Batman' Sanders: Trump tax plan makes 'rigged' system 'worse' MORE being asked, ‘Would you vote for Hillary ClintonHillary Rodham ClintonWant a tremendous deal on infrastructure spending? Suspend Davis-Bacon Constitutional amendment could vastly improve campaign finance The Hill's Whip List: Who to watch on GOP's new ObamaCare bill MORE?’ ” Rubio said, referring to the Democratic presidential candidates.

“If the front-runner was me or anybody else in this race, you wouldn’t have people asking that question. They’re asking it about Donald Trump for a reason. This is a guy that people have real reservations about.”

Rubio said he rejects the notion that Americans will have to pick the lesser of two evils between Clinton and Trump in November.

He said his decision to vote for Trump if he's the nominee is "a reflection of how bad I think Hillary Clinton is."

“[But] I don’t want us to reach this choice where it’s between Hillary Clinton and Donald Trump. I don’t want people to reach this choice where it’s between two people they don’t like or a choice if they’re staying home.”

Rubio and Trump’s other GOP presidential primary rivals vowed on Thursday night they would support the real estate tycoon should he become their party’s election standard bearer.

The Florida lawmaker, Sen. Ted CruzTed CruzOvernight Defense: Senators go to White House for North Korea briefing | Admiral takes 'hit' for aircraft carrier mixup | Lawmakers urged to beef up US missile defense Senators get North Korea briefing in unusual WH visit Overnight Tech: FCC chief unveils plan for net neutrality rollback | Tech on Trump's sweeping tax plan | Cruz looks to boost space industry MORE (R-Texas) and Gov. John Kasich (R-Ohio) uttered the pledge despite bashing Trump for two hours during the 11th Republican presidential debate, in Detroit.