Sen. Marco RubioMarco Antonio RubioStudents gather outside White House after walkout to protest gun violence Overnight Energy: Senate confirms Bridenstine as NASA chief | Watchdog probes Pruitt’s use of security detail | Emails shine light on EPA science policy changes Senate confirms Trump’s pick to lead NASA MORE (R-Fla.) on Friday reiterated that he would vote for Donald TrumpDonald John TrumpFlynn to campaign for Montana GOP Senate candidate Trump considering pardon for boxing legend after call from Sylvester Stallone Decline in EPA enforcement won't keep climate bill from coming 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) SandersHannity snaps back at 'Crybaby' Todd: 'Only conservatives have to disclose relationships?' Chuck Todd lashes out at Fox, defends wife in radio interview Trump pressed Sessions to fire FBI agents who sent anti-Trump texts: report MORE being asked, ‘Would you vote for Hillary ClintonHillary Diane Rodham ClintonGeorge HW Bush wears 'book socks' to Barbara Bush's funeral to honor her passion for literacy Obamas, Clintons to attend funeral of Barbara Bush Hillary Clinton to fundraise in DC for public charter high school 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 CruzCruz's Dem challenger slams Time piece praising Trump Race for Republican Speaker rare chance to unify party for election 32 male senators back Senate women's calls to change harassment rules 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.