Photo credit: Jim Rogash/Getty Images 
 
 Republican lawmakers are jumping off the Trump Train after the Washington Post revealed the GOP nominee’s fondness for committing sexual assault yesterday. Here’s a list of those 54 and counting who have renounced their endorsements—or, if they didn’t endorse him in the first place, made statements that you shouldn’t vote for him—and we’ll try to keep up with updating it as more “last straws” pour in: 
 
 Still endorsing Trump? Paul Ryan, Marco Rubio, and Ted Cruz, among many others. Republicans reacted to Joe Heck’s un-endorsement by booing and heckling him: 
 
 ||||| “Hundred percent,” Mr. Trump told reporters who yelled questions about whether he would stay in the race. He ignored other questions about his response to the defections by Republicans. 
 
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 Separately, one of Mr. Trump’s advisers, Rudolph W. Giuliani, a former mayor of New York City, was seen on CNN getting into a car outside Trump Tower, which he had earlier entered for planned debate preparation sessions. 
 
 “There is nothing that will cause his dropping out,” Mr. Giuliani said. “That is wishful thinking of the Clinton campaign and those who have opposed him for a long time.” 
 
 Though two of his biggest financial backers are sticking with him ... 
 
 Robert and Rebekah Mercer, the Republican megadonors who previously supported Senator Ted Cruz, suggested Mr. Trump’s remarks were irrelevant to the race. 
 
 “If Mr. Trump had told Billy Bush, whoever that is, earlier this year that he was for open borders, open trade and executive actions in pursuit of gun control, we would certainly be rethinking our support for him,” they said in a statement. 
 
 The Mercers also compared Mr. Trump’s actions to Bill Clinton’s treatment of women. The tactic is a favorite of Mr. Trump’s supporters, including Sean Hannity, the Fox News host, who devoted most of his show on Friday evening to allegations of abuse by Mr. Clinton. 
 
 ... many prominent Republicans have rescinded endorsements and distanced themselves from him. 
 
 • Condoleezza Rice, the secretary of state under President George W. Bush, who has generally has not discussed politics since becoming a private citizen, called for Mr. Trump to leave the race. She said she hoped to support someone who has the dignity and stature to be president. 
 
 “Enough!” Ms. Rice said in a Facebook post. “Donald Trump should not be President. He should withdraw.” 
 
 • Mr. McCain, who has criticized Mr. Trump repeatedly, officially withdrew his backing. “I have wanted to support the candidate our party nominated,” he said in a statement. He added: “But Donald Trump’s behavior this week, concluding with the disclosure of his demeaning comments about women and his boasts about sexual assaults, make it impossible to continue to offer even conditional support for his candidacy.” 
 
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 • House Speaker Paul D. Ryan said he was “sickened” by Mr. Trump’s behavior and disinvited him from a Saturday event in Wisconsin. There, he referred obliquely to the episode. “There is an elephant in the room. That is not what we are here to talk about today.” (Here’s how Mr. Ryan and Senator Mitch McConnell, the majority leader, have condemned Mr. Trump in past statements.) 
 
 • Former primary opponents such as Carly Fiorina and Gov. John Kasich of Ohio said Mr. Trump should stand down. Mr. Kasich declared that the warning signs were right and that he would never vote for Mr. Trump. 
 
 • Mr. Trump’s most strident defender, his running mate, Gov. Mike Pence of Indiana, called the remarks from the 2005 video indefensible. 
 
 • We are also tallying the number of Republican leaders who say they won’t vote for Mr. Trump. 
 
 Some Republicans want to dump Trump. Can they? 
 
 Experts say that swapping out a presidential nominee at this stage of the game would be virtually impossible unless Mr. Trump dies, becomes incapacitated or decides to quit. 
 
 Trying to change the Republican National Committee’s rules with so little time until Election Day would be a logistical nightmare, and those rules do not give the party the power to change the nominee because people are unhappy. 
 
 If Mr. Trump did decide to drop out, the logistics would also be challenging because ballots have been printed and voting has already started in many places. We break it down in our Q. and A. 
 
 Still, as unlikely as that scenario appears to be, that remains the best hope for finding a new nominee. 
 
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 The debate on Sunday will be must-see TV. 
 
 The showdown between Mr. Trump and Mrs. Clinton on Sunday night takes on even greater importance after Mr. Trump’s latest controversy. Unless he speaks beforehand, it will be his first chance to publicly take questions about his behavior on the recording. The audience could approach 100 million. 
 
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 Many Republicans who have yet to denounce Mr. Trump have suggested that the debate will be a make-or-break moment for him. 
 
 And here are our best photos from the week. 
 
 Take a look.
– More than three dozen Republican lawmakers either rescinded their endorsements of Donald Trump or urged their supporters not to vote for him Saturday, reports Deadspin, which is keeping a running tally. Notable names include Sen. Kelly Ayotte, Sen. Mike Lee, Gov. John Kasich, and Sen. John McCain. "Donald Trump's behavior this week, concluding with the disclosure of his demeaning comments about women and his boasts about sexual assaults, make it impossible to continue to offer even conditional support for his candidacy," the Arizona Republic quotes McCain as saying in a statement. On Friday, a 2005 video was released showing Trump endorsing sexual assault and otherwise speaking lewdly about women. "Nothing that has happened in the last 48 hours is surprising to me," Politico quotes a statement from Kasich, who says he won't be voting for Trump. And Carly Fiorina is calling for Trump to drop out of the race, the New York Times reports. Trump's running mate, Mike Pence, decried Trump's statements, saying he was unable to defend them. And Trump's replacement on Celebrity Apprentice, Arnold Schwarzenegger, says he won't be voting for a Republican presidential candidate for the first time in 33 years, according to the Hill. But Trump is far from losing all support. Paul Ryan, Marco Rubio, Ted Cruz, and others are still sticking by their endorsements for the time being. And Rep. Joe Heck of Nevada was booed and heckled at an event when he took back his Trump endorsement. Trump has said he will remain in the race.