Real estate mogul Donald Trump is threatening sue HBO comedian Bill Maher over a bet over whether the billionaire’s mother had sex with an orangutan.

During an interview with NBC’s Jay Leno earlier this week, Maher had mocked Trump’s absurd offer of $5 million if President Barack Obama could prove he was a U.S. citizen. Maher said that he would donate $5 million to the “Hair Club for Men” or “Institute for Incorrigible Douchebaggery” if Trump produced evidence to counter the claim that he “had been the spawn of this mother having sex with an orangutan.”

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“The other night on Jay Leno’s show, he made an absolute offer, I made an absolute acceptance,” Trump explained to Extra on Wednesday. “I sent him documentation and he owes me $5 million, which I’m going to give to charity.”

“Let’s see what happens, and if he doesn’t pay the money, we will probably sue him,” he added. “Yeah, I think I’d sue him. He made and offer, we accepted the offer. I’d probably sue him.”

Watch this video from Extra, broadcast Jan. 9, 2013.

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(h/t: Political Wire)