Rubio: 'We’re the underdog, and that’s a role that I relish'
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Republican presidential candidate Sen. Marco RubioMarco Antonio RubioRubio: McCabe 'should've been allowed to finish through the weekend' For Tillerson, bucking Trump became a job-killer At least six dead after pedestrian bridge collapses on cars in Florida MORE (Fla.) denied on Sunday that his strategy for Super Tuesday is "survival," vowing to stay in the race "as long as it takes."

"Obviously, we're not the front-runner here, we’re the underdog, and that’s a role that I relish," he said on CBS's "Face the Nation" Sunday morning.

"I’ve been an underdog my whole life, both in life and in politics, and we’re going to do well. We’re going to pick up a lot of delegates on Super Tuesday. As you know, they are awarded proportionally, and we’re going to move on."

He said the Republican Party will never rally behind presidential candidate Donald TrumpDonald John TrumpLieu: There will be 'widespread civil unrest' if Trump fires Mueller Attorneys for Trump, Mueller hold face-to-face meeting to discuss potential interview topics: report Trump tariffs not helpful for nuclear talks, South Korea says MORE. He then hit on Trump, saying the billionaire is neither a Republican nor a conservative.

"Donald Trump is trying to pull off the biggest scam in American political history," Rubio said.

"Basically a con job where he’s trying to take over the Republican Party by basically telling people who he’s not, and so we’re going to do whatever it takes."

Rubio said he plans to stay in the race "as long as it takes" to win the nomination.