Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE is poised to win almost all of the states voting on Super Tuesday, despite warnings from his rivals and other GOP critics that the party could split apart at the seams if he becomes the presidential nominee.

Unless there is a huge upset on Tuesday, Trump will take another massive leap toward the nomination. He has won three out of four contests so far and has secured almost five times as many delegates as his closest rival, Texas Sen. Ted Cruz Rafael (Ted) Edward CruzLoeffler calls for hearing in wake of Netflix's 'Cuties' Health care in the crosshairs with new Trump Supreme Court list 'Parks and Rec' cast members hosting special reunion to raise money for Wisconsin Democrats MORE. Trump has 82 delegates to Cruz’s 17.

The prospect of a Trump nomination is abhorrent to many in the Republican Party.

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The ramifications would be “huge and catastrophic,” according to Peter Wehner, who served in the administrations of the three most recent Republican presidents: Ronald Reagan, George H.W. Bush and George W. Bush. “This would be an epic political moment because it would be the fundamental redefinition of a great political party. It would, in many ways, be a dismantling of it.”

Wehner, despite the length of his association with the GOP, is adamant that he would not support Trump in a general election, even against Democrat Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE.

“I am not going to vote for Trump under any circumstances,” Wehner said. “I see him as an existential threat ... a threat to America and the Republican Party and conservatism unlike anything I have ever seen.”

Such views are gaining wider currency as conservatives emerge from a lengthy period of denial to confront the fact that the celebrity businessman is now a red-hot favorite to become the GOP standard-bearer.

Trump holds clear polling leads in seven of the 11 contests Republicans will hold Tuesday. A candidate other than Trump is the favorite in just one state: Cruz, in his home state of Texas. The other three states suffer from a dearth of reliable polling.

A strong performance by Trump could see him build up so much momentum as to render him unstoppable.

In a reflection of how high the stakes have become — and of how ineffective anti-Trump attacks have been so far — the race took a lurch toward nastier ground over the weekend. Florida Sen. Marco Rubio Marco Antonio RubioFlorida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Intelligence chief says Congress will get some in-person election security briefings MORE mocked the billionaire for his tan (“he needs to sue whoever did that to his face”) and his small hands. Trump hit back, blasting the Floridian as “Little Marco” and “a very nasty guy” during an appearance on “Fox News Sunday.”

Further fueling the feverish atmosphere now enveloping the GOP race, Trump three times declined to disavow former Ku Klux Klansman David Duke during an appearance on another Sunday political talk show, CNN’s “State of the Union” with Jake Tapper.

That performance earned condemnation from 2012 GOP nominee Mitt Romney, who described the remarks as “disqualifying & disgusting” in a Monday tweet. MSNBC anchor Joe Scarborough, who has previously been described as friendly toward Trump, also called the remarks “disqualifying.”

Trump later blamed the peculiar exchange on a faulty earpiece.

In another example of mounting GOP panic, Sen. Ben Sasse (R-Neb.) took to social media on Sunday to express broader opposition to Trump’s campaign. He assailed the real estate mogul in a series of tweets and, in a letter posted to his Facebook page, announced that in a hypothetical match-up between Trump and Clinton, he would vote for neither.

Sasse’s Facebook posting asserted that “Mr. Trump’s relentless focus is on dividing Americans, and on tearing down rather than building back up this glorious nation.” Sasse also suggested that Trump’s use of the word “reign” was “creepy,” saying it seemed as if “he thinks he’s running for King.”

As for the future of the Republican Party, Rubio warned on Friday that “the Republican Party would be split apart if he became the nominee, because we cannot allow the party of Reagan to be taken over by a con man.”

There is a real divide even among elected officials about Trump.

New Jersey Gov. Chris Christie, who dropped out of the White House race in February, delivered a seismic shock to party insiders when he endorsed Trump on Friday. Then the New York tycoon gained his first senatorial endorsement, when Sen. Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE (R-Ala.) backed him on Sunday. The senator’s home state votes on Tuesday, and Trump has a lead of almost 18 points there, according to the ­RealClearPolitics average.

Rep. Scott DesJarlais (Tenn.) and Rep. Tom Marino (Pa.) also backed Trump on Monday, becoming the third and fourth GOP House members to do so. The others are Reps. Duncan Hunter (Calif.) and Chris Collins (N.Y.).

The endorsements cause indignation among those who are most vigorously opposed Trump.

“This is a man utterly unfit to be president of the United States and nobody should be pretending otherwise,” said Eliot Cohen, a professor at Johns Hopkins School of Advanced International Studies. Cohen worked in the State Department during George W. Bush’s administration and was a special adviser on foreign policy to Romney during the 2012 campaign.

Of Trump’s candidacy in general, Cohen added, “It’s just dreadful. And I should be clear, I am a Republican. It’s extremely painful.”

Asked about the Christie endorsement, in particular, Wehner said, “I thought it was shameful — just unbelievably shameful. ... It was sheer political opportunism.”

Christie, of course, would vigorously reject that characterization. At his speech in Texas announcing his backing of Trump, the New Jersey governor insisted that “there is no one who is better prepared to provide America with the strong leadership that it needs both at home and around the world than Donald Trump.”

Some establishment-minded Republicans continue to hold out hope that some kind of machinations at the Republican National Convention could wrest the nomination out of Trump’s grasp. But such an outcome would engender an enormous counter-reaction from the businessman’s supporters.

And there is no guarantee such a maneuver will even be possible.

“One can argue that he has thrown out the old rule book and, ‘well, if he has thrown out the old rule book, you can’t rule out a brokered convention,’ ” said Cohen. “But at the moment, he looks like the favorite. You have to admit it.”