On Monday, the John Kasich campaign released a remarkable video in which one of the Ohio governor’s supporters, Colonel Tom Moe, a Vietnam veteran and former POW, speaks against Donald Trump by paraphrasing Martin Niemoller’s famous “First they came” speech about the dangers of apathy in the face of Nazism. “You might not care if Donald Trump says Muslims must register with their government because you are not one,” Moe says with Midwestern calm. “And you might not care if Donald Trump says he’s going to round up all the Hispanic immigrants, because you are not one. And you might not care if Donald Trump says it is okay to rough up black protesters, because you are not one. And you might not care if Donald Trump wants to suppress journalists, because you are not one. But think about this: If he keeps going, and he actually becomes president, he might just get around to you, and you better hope there is someone left to help you.”

With its implicit linkage of Trumpism with fascism, Moe’s speech puts into stark relief the question of what happens if Trump “actually becomes president.” It also poses a dilemma for Kasich himself. During the first Republican debate, Kasich and all the other candidates were asked if they would promise to “support to the eventual nominee of the Republican Party and pledge to not run an independent campaign against that person.” Aside from Trump, they all said yes. Which means that Kasich—along with Jeb Bush, Marco Rubio, Chris Christie, Carly Fiorina, and the rest of the field—are committed to backing Trump if he is their party’s nominee.

Although he continues to dominate the polls, the possibility of Trump triumphant still seems improbable. His long habit of making racist comments has only intensified in recent days, when he’s falsely claimed that thousands of Arab Americans in Jersey City cheered on the 9/11 attacks and re-tweeted bogus statistics about the black crime rate that originated from an avowed admirer of Adolf Hitler. He has virtually no institutional support in the party, is doing only cursory fundraising, and remains stingy about spending his own money, preferring to ride on the ample free publicity he receives. Trump is clearly betting that his strong polling performances will translate into actual votes.

His gamble could pay off. And then the GOP will face a major dilemma, since the other candidates and party establishment will have to support a nominee they despise, and likely think is unfit for office. Trump has insulted almost all the other candidates in the most vicious ways imaginable, making derogatory comments about Bush’s energy level and marriage to a Mexican American, Rubio’s ethnicity, Fiorina’s physical appearance, and Ben Carson’s supposed similarities to child molesters, among other bon mots.

The Republican Party faces a nightmare scenario with Trump as its nominee, with two possible outcomes—both of which are unappetizing. The more likely possibility is that Trump could so offend the general public that the GOP would get a historic electoral drubbing to rival the 1964 defeat of Barry Goldwater, who carried only a handful of states and handed over super-majorities to Democrats in Congress and the Senate. Democrats are highly unlikely to win such super-majorities in 2016, but with the Republican ticket headed by a loudmouth bigot they could certainly pick up seats in the House and re-take the Senate.