Obama to Leno: Issue with Trump ‘dates back to when we were growing up together in Kenya’

While a Panda ticked off a Tiger on a field in San Francisco Thursday night, a circus of a different variety was being played out, triggered by Donald Trump's YouTube video.

Trump's offer—$5 million to the charity of the president's choice in exchange for the release of Obama's college and passport applications—was mocked mercilessly on Twitter.

On "The Tonight Show With Jay Leno," President Barack Obama laughed it off, joking to Leno that the bad blood between him and the real estate mogul turned "birther" conspiracy theorist "dates back to when we were growing up together in Kenya."

"Barack Obama is the least transparent president in the history of this country," Trump said in the video, shot from his New York office. "I have a deal for the president. ... If Barack Obama opens up and gives his college records and applications and if he gives his passport applications and records I will give to a charity of his choice—inner-city children in Chicago, American Cancer Society, AIDS research, anything he wants—a check immediately for $5 million."

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Trump defended the offer Thursday night. "It's a serious, very serious offer," he told CNN's Piers Morgan. "I can't imagine that for $5 million that he wouldn't do it."

The "Celebrity Apprentice" star dismissed the backlash to his stunt, also telling Morgan, "I've had tremendous praise for the most part."