Secretary of State Mike Pompeo pushed back Friday against former secretary of state Hillary Clinton's claim that there was no regulation against her use of a private email server.

"No, having a private email server and keeping your government records on that is completely unlawful," Pompeo said during an interview on Fox & Friends.

"She has been investigated a lot, I think there might be a reason for that," Pompeo added. "We have an obligation, as senior leaders in the United States government, that our records are protected and available through [the Freedom of Information Act] and all the other mechanisms."

"It's a bad idea," Pompeo said regarding the destruction of records. "Not a model that I recommend to any leader anywhere."

In a documentary released by Hulu, Clinton claimed she was the "most investigated innocent person in America" and defended her use of a private server as secretary of state.

"I did it as a matter of convenience. There was no regulation against it, there was nothing against it," Clinton said, according to the Daily Mail. "Everybody knew I was doing it because they were all emailing me and I was emailing them and that was hundreds and hundreds of people in government."

While Clinton argued her subordinates did not object to her use of a personal email server, a former State Department official testified that he raised concerns about it.

Clinton also described the multiple congressional investigations into her conduct as "character" attacks.

The Hulu documentary, titled Hillary, came out Friday.