Host Jimmy Fallon asked him, playfully, if the billionaire developer and GOP presidential front-runner has ever apologized for anything.

"I fully think apologizing is a great thing," the famously self-assured Trump replied before winning the studio audience's applause by adding: "But you have to be WRONG. ... I will absolutely apologize sometime in the hopefully distant future if I'm ever wrong."

That's how it went, with both Fallon and the audience eating out of his hand.

In what passed as one of the segment's more serious moments, Fallon asked what Trump was doing on the campaign trail that his Republicans aren't to win support from voters.

"I think they want our country to be respected again," Trump said. "I think they feel that if I'm president, I will do some great things for our country, and we're gonna be respected again.... There's a movement going on, and it's amazing to watch."