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Former Inspector General Charles McCullough III expanded on revelations he made in an interview Monday with Catherine Herridge.

Former President Barack Obama appointed McCullough, a former FBI agent, to oversee the intelligence community.

He said that he received pushback when he began communicating concerns about Hillary Clinton's private email server with then-DNI James Clapper.

McCullough said that seven senators wrote a letter accusing him of politicizing the matter, chief among them, Sen. Dianne Feinstein (D-Calif.).

He said he had a secure telephone conversation about the issue with Feinstein.

He added that it was "maddening" that some Democrats were pointing to the fact only a few files from the server were marked "classified."

McCullough on @HillaryClinton emails: "Even if the information isn't marked properly when it's disseminated, it's still classified." #Tucker pic.twitter.com/b3E7qH0zvz — Fox News (@FoxNews) November 29, 2017

"It's absolutely irrelevant whether something is marked classified, it is the character of the information," he said.

McCullough said that from that point forward, he received only criticism and an "adversarial posture" from Congress when he tried to rectify the situation.

"I expected to be embraced and protected," he said, adding that a Hill staffer "chided" him for failing to consider the "political consequences" of the information he was blowing the whistle on.

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