Sen. Marco RubioMarco Antonio RubioOvernight Defense: Tillerson, Trump deny report of rift | Tillerson says he never considered resigning | Trump expresses 'total confidence' in secretary | Rubio asks Army to kick out West Point grad Rubio asks Army to kick out West Point grad with pro-communist posts GOP establishment doubts Bannon’s primary powers MORE (R-Fla.) on Friday reiterated that he would vote for Donald TrumpDonald John TrumpIvanka Trump pens op-ed on kindergartners learning tech Bharara, Yates tamp down expectations Mueller will bring criminal charges Overnight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open 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 SandersBernard (Bernie) SandersChris Murphy’s profile rises with gun tragedies Clip shows Larry David and Bernie Sanders reacting after discovering they're related For now, Trump dossier creates more questions than answers MORE being asked, ‘Would you vote for Hillary ClintonHillary Diane Rodham ClintonChris Murphy’s profile rises with gun tragedies DNC, RNC step up cyber protections Gun proposal picks up GOP support 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 CruzRafael (Ted) Edward CruzWhatever you think the Alabama special election means, you’re probably wrong This week: Congress gets ball rolling on tax reform Week ahead: Senators work toward deal to fix ObamaCare markets 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.