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The FBI investigation into Hillary Clinton’s use of private email as secretary of state has reportedly unearthed a "treasure trove" of financial improprieties related to the Clinton Foundation, Judge Andrew Napolitano said on "The Kelly File" tonight.

Judge Napolitano explained that a source told him about a possible intersection of Clinton's work with the Foundation and State Department business, which may have violated public corruption laws.

"I have a source that says the FBI has a 'treasure trove' of financial documents showing financial improprieties, as well as a pattern of decisions by Mrs. Clinton as secretary of state and favorable treatment to the people for whom she made the decision, and then contributions to the Clinton Foundation," Judge Napolitano said.

He added that the State Department released two new emails over the weekend that reveal Clinton showed an intention to deviate from her obligation to keep secrets secure.

He said it's hard to believe that the FBI - in the age of terror, no less - would be expanding its investigation into Clinton if it was simply a wild goose chase.

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