An Obama-appointed inspector general said he was marginalized and threatened when he raised alarm about former Secretary of State Hillary Clinton's private email server.
Charles McCullough, who oversaw the intelligence community, said he contacted then-Director of National Intelligence James Clapper about the issue.
McCullough said he was later told not to report his concerns to Clapper, and received "personal blowback... to my family [and] my office."
"Emails beyond Top Secret passed through the unsecured server," he said.
McCullough later told Catherine Herridge that he found out he would be one of the first firings of Hillary Clinton's prospective administration.
Herridge said she didn't not receive an immediate response to McCullough's report from Clinton campaign officials.
Watch more above and read Catherine's full report, here.