The FBI has been investigating the Clinton family's foundation for more than a year about whether it conducted a pay-to-pay scheme, Fox News reported Wednesday night.

According to Fox News anchor Brett Baier, the FBI's white collar crime and public corruption division is heading up the investigation. Baier quoted a source that claimed the case is "very high priority" for the bureau, likely due to Clinton's position as the Democratic presidential nominee.

At the same time, the FBI continues to look through a laptop recently discovered as part of an investigation into former Rep. Anthony Weiner's sexting scandal. Weiner's estranged wife Huma Abedin is Clinton's top aide, and the bureau found hundreds of thousands of Abedin's emails on the laptop. At least some of them, Baier reported, are new and were not previously discovered as part of the investigation into Clinton's private email server.

The FBI dished out several immunity deals to Clinton aides in exchange for their testimony, but Baier reported those deals will be torn up if anyone lied during questioning.

"I think it shouldn't be surprising to us that the Clinton Foundation has been the subject of investigation," former assistant U.S. attorney Andrew C. McCarthy told Fox News.

McCarthy also spoke about President Barack Obama, who has said he wasn't aware Clinton was using a private server as secretary of state. Emails, however, show the president exchanged several emails with Clinton's private address.

"I think if I were the president and I had communicated with Mrs. Clinton some 18 times using an alias over a non-secure e-mail system and then looked the American people in the eye and said that I didn't even know that she had private email or she used private email, I would really stop talking about this case," McCarthy said.

Obama called Clinton's decision to use private email an "honest mistake," a claim former NYPD commissioner Bernie Kerik called comical.

FBI director James Comey said last Friday his agency is taking another look at Clinton's email case because of what was found on Weiner's laptop.