Sanders lamented to HBO “Real Time” host Bill Maher that he “would have loved” to debate Trump.

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The idea of an unprecedented debate between Trump, the presumptive GOP presidential nominee, and Sanders, a Democratic candidate, captivated the political world in recent days, but Trump threw cold water on the idea Friday afternoon.

"First he said he would do it. Then he said he wouldn't do it. Then he said he would do it. Then he said he wouldn't do it,” Sanders said.

“So I would hope that if he changed his mind four times in two days, change it a fifth time. You know, Trump claims to be a real tough guy, pushes people around. Hey, Donald, come on up. Let's have a debate about the future of America."

"Mr. Macho chickened out," added Maher, an avowed Sanders supporter.

Sanders said Trump as president “would be not only an embarrassment, a real danger to this entire world.”

The Vermont senator added that Trump would be hard to run against in the general election because “he lies all the time, because he changes his mind all the time.”

Trump on Friday said it would be “ inappropriate ” to debate Sanders, calling him a “second place finisher.”

His statement ended days of speculation that began when Trump said on “Jimmy Kimmel Live” on Wednesday night that he would be willing to face Sanders in an unusual, bipartisan debate if it raised money for charity.

Trump said Thursday he would “love to debate Bernie,” one day before backing out.