Despite telling his supporters he represents America's last chance to save itself, Donald Trump has reportedly admitted he thinks it is "okay" if he doesn't win the 2016 presidential election.

In an interview with New York Magazine, Mr Trump's campaign manager Kellyanne Conway admitted she got "really mad at him the other day" when he revealed his indifference to the result.

She told the magazine: “He said, ‘I think we’ll win, and if not, that’s okay too. And I said, ‘It’s not okay! You can’t say that! Your dry-cleaning bill is like the annual salaries of the people who came to your rallies, and they believe in you!'"

US election 2016: the race for the White House in pictures Show all 12 1 /12 US election 2016: the race for the White House in pictures US election 2016: the race for the White House in pictures Republican U.S. presidential nominee Donald Trump shakes hands with Democratic U.S. presidential nominee Hillary Clinton at the conclusion of their first presidential debate at Hofstra University in Hempstead, New York Reuters US election 2016: the race for the White House in pictures President Barack Obama embraces Democratic nominee Hillary Clinton on stage at the party's convention in Philadelphia US election 2016: the race for the White House in pictures Donald Trump's wife Melania delivered a speech at the GOP convention in Cleveland that was later found to have been cribbed in part from Michelle Obama's 2008 convention address AP US election 2016: the race for the White House in pictures Hillary Clinton talks to reporters aboard her new campaign plane on Labour Day, 5 September, her first 'press conference' since 2015 (Getty Images) US election 2016: the race for the White House in pictures Donald Trump held a joint press conference with Mexican leader Enrique Pena Nieto in Mexico City in August, hours before reiterating his harsh immigration plans at a campaign rally in Arizona Reuters US election 2016: the race for the White House in pictures Bernie Sanders officially endorsed Hillary Clinton, saying his progressive vision for ‘a transformed America’ would be ’best served by the defeat of Donald Trump’ Reuters US election 2016: the race for the White House in pictures Khizr and Gazala Khan appeared at the DNC to slam Trump for his stance on Muslim immigration, citing the case of their son Humayun Khan, who was killed in combat while serving as a Captain in the US Army in Iraq US election 2016: the race for the White House in pictures Libertarian candidate Gary Johnson is doing better in polls than any third party candidate since Ross Perot, 20 years ago Nicholas Kamm/AFP/Getty US election 2016: the race for the White House in pictures Green Party candidate Jill Stein (centre) marches with supporters in Colorado AP US election 2016: the race for the White House in pictures Hillary Clinton and Virginia Senator Tim Kaine at a rally in Kaine's home state in July, days before Ms Clinton tapped him to be her running mate Getty US election 2016: the race for the White House in pictures Trump on the campaign trail with his vice presidential pick, Indiana governor Mike Pence AP US election 2016: the race for the White House in pictures Former Ukip leader Nigel Farage appears at a Trump rally in Mississippi in August, where he told the crowd that he 'wouldn't vote for Hillary Clinton if you paid me'.

Mr Trump has previously admitted he will "go back to a very good way of life" if he loses the election.

In August, he told CNBC: "If at the end of 90 days I've fallen short, it's okay. I go back to a very good way of life...

"At the end its either going to work or I'm going to, you know, I'm going to have a very nice long vacation."

Ms Conway said she confronted the Republican presidential nominee about his "nice long vacation" comments, she told the New Yorker: “I told him, ‘You can’t say that.’"

She added: “You’ve built a whole movement, and people feel like they’re part of it. Mr. Trump, people have stood in the rain for three hours just to say they were there when you were there.

"They so believe in you that when you say, ‘Eh, if it doesn’t work out, I’ll go back to the happy place,’ they don’t think that they will.”

Swing states: how could they determine Trump or Clinton win?

Despite his previous comments, Mr Trump began a final-week sprint to election day by unleashing a new attack against Hillary Clinton in Michigan.

"Her election would mire our government and our country in a constitutional crisis that we cannot afford," Mr Trump declared in Grand Rapids, pointing to the FBI's renewed examination of Mrs Clinton's email practices as evidence the former secretary of state might face a criminal trial as president.

National polls show a tightening race but with more than 23 million ballots already cast through early voting, it is unclear whether Mr Trump has the time or capacity to dramatically improve his standing over the next week in states like Michigan, where few political professionals in either party expect a Republican victory on 8 November.

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Mr Trump is sitting just one per centage point behind Ms Clinton, according to the latest Washington Post-ABC News Tracking Poll.

His odds of winning halved as a result of the impact of the FBI reopening its investigation into Ms Clinton's use of a private email server while Secretary of State.