A struggling Sen. Marco Rubio has said a Trump nomination would be a “calamity” for the GOP and possibly cause the Party to disintegrate.

“It could be the end of the Republican party,” he said on Sunday. “It will split us and splinter us in a way that we may never be able to recover.”

Despite Donald Trump’s solid lead in the polls in nearly all Super Tuesday states, Rubio, Sen, Ted Cruz and Gov. John Kasich offered up confidence during the Sunday talk shows that their campaigns will succeed.

Rubio, appearing on ABC’s “This Week,” tried to seem excited about his Super Tuesday prospects despite middling poll numbers.

“Obviously we’re not we’re not the front-runner here, we’re the underdog and that’s a role that I relish,” he said. “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.”

The Florida senator was also confident he was “going to win” in his home state, despite trailing Trump in polls there by an average of 20 points, according to RealClearPolitics.

Rubio’s confidence in victory rests on his assumption that voters will believe that Trump is pulling a scam on Republican voters. “We’re not going to allow a con artist to take over the party of Lincoln and Reagan,” he said, using the latest line he’s been using.

Unfortunately for Rubio, a plurality of Republican voters want to see Trump take over the GOP. Despite this, Rubio was adamant that he will “beat [Trump] outright in the primary process.”

Cruz also claimed Super Tuesday would be a good day for his campaign. “I think there’s going to be a big drop off between me and Donald and the other delegates,” he told Chuck Todd on NBC’s “Meet the Press.”

“There’s only one candidate who has beaten Donald Trump and one who can beat Donald Trump,” Cruz said, a message he repeated, in full Rubio robotic fashion, on both CNN’s “State of the Union” and ABC’s “This Week.”

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But Cruz also seemed eager to attack Trump heading into Super Tuesday and protect his lead in Texas, highlighting his donations to Democrats and going as far to suggest to Todd that “Donald’s business dealings with the mob” might be one reason that Trump hasn’t released his taxes.

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Kasich insisted he is still a serious contender for the nomination and can beat Trump, Cruz and Rubio to secure it.

“I’m very happy with where we are,” Kasich told Jake Tapper on CNN’s “State of the Union.” He denied Gov. Chris Christie’s assertion that Trump is the only one capable of defeating Clinton.

“I’m beating HIllary Clinton by more than anyone else in the field,” Kasich claimed. And despite admitting that “Trump’s going to win probably all of” the states on Super Tuesday, Kasich asserted that “what changes this race is my ability to win Ohio.”

Kasich said he is confident of a win in his home state. “I’m running even with Donald Trump in Ohio without making any real effort” there, he said. “I’m going to win Ohio — and that’s what creates a whole new race,” he said on “Meet the Press.”

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Should Trump win the nomination, the other candidates must be prepared to rally around him and present a united front against Clinton — or Sanders — and the Democrats.

Cruz and Kasich are prepared to do this. “I will support the Republican nominee, period, the end,” Cruz told CNN’s Jake Tapper. Kasich echoed those sentiments. “Anybody that emerges from the arena, I’m going to be for,” he said on “State of the Union.”

Rubio, with his comments about Trump destroying the GOP, did not appear to be as open to the possibility of a Trump nomination, though he wasn’t directly asked.

Trump’s earning the nomination doesn’t need to split the GOP. But if some of the more moderate, pro-Establishment Republicans who are supporting Rubio, not to mention Rubio himself, continue to attack Trump in such hyperbolic terms and alienate the voters who support him — then the Republican Party’s future is truly in doubt.