Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE and Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE will take the stage for their second debate Sunday evening amid an extraordinary political atmosphere.

Trump, the Republican presidential nominee, has faced calls from prominent members of his own party to drop his White House bid, after a recording emerged on Friday of him using vulgar and aggressive language about women in 2005.

It is an unprecedented situation for the nominee of a major party.

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Trump has been adamant about not leaving the race, telling The New York Times that he would not do so “in a million years” and insisting he can still win the presidency.

But neither those words, nor the video statement Trump released around midnight Friday, have quelled the sense of crisis that has enveloped his party. Whether he can do anything on the debate stage on Sunday to break the fever remains to be seen.

"I don’t see how he can do any kind of political repair," said Democratic strategist Craig Varoga. "For the good of America, [Clinton] just needs to speak up for all the people in this country who would never approve of this behavior."

By Saturday afternoon, several Republican senators had called for Trump to drop out of the race, including the party’s third-ranking member in the upper chamber, Sen. John Thune John Randolph ThuneSenate GOP sees early Supreme Court vote as political booster shot Romney backs pre-election Supreme Court vote, paving way for McConnell, Trump Senate GOP faces pivotal moment on pick for Supreme Court MORE (S.D.). And other Republican lawmakers, including Sen. John McCain John Sidney McCainCindy McCain endorses Biden: He's only candidate 'who stands up for our values' Biden says Cindy McCain will endorse him Biden's six best bets in 2016 Trump states MORE (Ariz.) and Rep. Jason Chaffetz Jason ChaffetzThe myth of the conservative bestseller Elijah Cummings, Democratic chairman and powerful Trump critic, dies at 68 House Oversight panel demands DeVos turn over personal email records MORE (Utah), withdrew their support of the nominee.

Trump’s own running mate, Indiana Gov. Mike Pence Michael (Mike) Richard PenceButtigieg stands in as Pence for Harris's debate practice Trump argues full Supreme Court needed to settle potential election disputes Pence adviser knocks ex-staffer who criticized Trump on COVID-19 MORE, has said he was “offended” by the nominee’s words and decided not to appear at a GOP fundraiser Saturday alongside Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) in Trump’s stead.

The situation Trump finds himself in is so grave that it is not immediately clear what would constitute success for him in the debate, which takes place at Washington University in St. Louis Sunday night.

The bombshell tape is sure to come up. In it, Trump spoke in crude terms about his pursuit of an unnamed woman and claimed that his celebrity status enabled him to “do anything” to women, including “grab them by the p---y.”

Trump’s wife, Melania Trump, released a statement on Saturday afternoon calling her husband’s words “unacceptable and offensive to me” but also asserted that it did not “represent the man I know.”

Pence, for his part, has suggested that the debate presents Trump with an opportunity to “show what is in his heart.”

But the prospect that voters will see contrition from Trump on Sunday evening is far from guaranteed.

His late-night video apology included a jab at former President Bill Clinton William (Bill) Jefferson ClintonChelsea Clinton: Trump isn't building public confidence in a vaccine Hillary Clinton launching podcast this month GOP brushes back charges of hypocrisy in Supreme Court fight MORE for his treatment of women and the accusation that “Hillary has bullied, attacked, shamed and intimidated his victims.”

Trump managed to largely steer clear of diving into that line of attack when faced with sexism accusations at the first debate, but he may choose to go on the offensive this time around. Some fellow Republicans, including Sen. Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (S.C.), have publicly cast doubt on the likely effectiveness of such a tactic.

Sunday’s debate is the only one of the three clashes that will be held in a town hall setting, where the candidates will field questions from audience members. The dynamics of such debates are challenging even under normal circumstances.

For Trump, the dangers seem plain.

If audience members blanch at raising the most shocking elements of the recording on Sunday, the co-moderators, Anderson Cooper of CNN and Martha Raddatz of ABC News, may be quick to bring up the issue themselves.

And Hillary Clinton, the Democratic nominee, who initially called Trump’s comments “horrific” in a Friday tweet but then fell silent on the issue, will surely use the controversy for all it's worth to attack him, with or without help from the moderators.

The scandal — the most grave of Trump’s furor-filled run for the presidency — comes with only a little more than four weeks to go until Election Day and early voting underway in some states. It is also the nadir of a bleak period for the Republican nominee that began with his performance in his first debate against Clinton on Sept. 26.

He was widely perceived to have lost that encounter. Since then he has extended a feud with a former Miss Universe, been hit with a New York Times exposé on his tax returns, seen his poll ratings dip and become enmeshed in several other disputes.

As of Saturday afternoon, Clinton held a lead of around 3 percentage points in the RealClearPolitics national polling average and was well placed in most battleground states. Virtually no one, in either party, denies that Clinton’s lead is likely to grow in the wake of the Trump recording.

This leaves the former secretary of State in the curious position of being the undisputed front-runner, yet not the center of attention, on Sunday night.

One thing to watch will be whether Clinton, an audience member or one of the moderators addresses the Trump tape first. The body language between the two will also be scrutinized — some liberal voices on social media have suggested that Clinton should decline to shake hands with Trump.

The Trump tape could have another beneficiary: TV broadcasters.

Before the latest revelations, it had been assumed that the 84 million people who watched the first Trump-Clinton clash on TV would be the largest audience for any of the three debates.

Now, the audience that will tune in on Sunday evening might even surpass that figure. If it does, it will set a new all-time high for a presidential debate.