Washington (CNN) Donald Trump on Monday accused Hillary Clinton of being the first to spread the theory that President Barack Obama is a Muslim who was not born in the United States.

"That's where it began," Trump said Monday on Fox News. "Look at what she said about President Obama in 2008, believe me what I said is nothing. Take a look at what Hillary said in 2008 when she was running against him."

Trump was one of the most high-profile proponents of the "birther" theory and repeatedly challenged Obama to release his birth certificate. Trump suggested then that Obama might be refusing to release his birth certificate because it might show he was a Muslim. Obama eventually released a long-form birth certificate proving he was born in the U.S.

When asked in a 2008 CBS "60 Minutes" interview whether she believed Obama was a Muslim, Clinton said "of course not," noting that "there is no basis for that."

"There's nothing to base that off, as far as I know," Clinton said in that interview, an answer that critics panned at the time.

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