A former FBI official said Sunday that Bill and Hillary Clinton Hillary Diane Rodham ClintonLanny Davis says Nixon had more respect for the Constitution than Trump Clinton commemorates Sandy Hook anniversary: 'No child should have to fear violence' Sanders, Warren meet ahead of potential 2020 bids MORE are part of a “crime family” and argued top officials hindered the investigation into Hillary Clinton’s private email server while she was secretary of State.

During a radio interview with John Catsimatidis, former assistant FBI director James Kallstrom heaped praise on Republican presidential nominee Donald Trump Donald John TrumpAustralia recognizes West Jerusalem as Israeli capital, won't move embassy Mulvaney will stay on as White House budget chief Trump touts ruling against ObamaCare: ‘Mitch and Nancy’ should pass new health-care law MORE before taking aim at the Clintons.

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“The Clintons, that’s a crime family, basically,” Kallstrom said. “It’s like organized crime. I mean the Clinton Foundation is a cesspool.”

Kallstrom, best known for leading the investigation into the explosion of TWA flight 800 in the late '90s, said that Hillary Clinton, the Democratic presidential nominee, was a “pathological liar.”

He also blasted Attorney General Loretta Lynch, claiming that she impeded the investigation into Clinton’s private server.

“The problem here is this investigation was never a real investigation,” he said. “That’s the problem. They never had a grand jury empanelled, and the reason they never had a grand jury empanelled, I’m sure, is Loretta Lynch would not go along with that.”

“God forbid we put someone like that in the White House,” he added of Clinton.

Kallstrom also said that FBI Director James Comey and the rest of the FBI’s leadership were responsible for holding back the investigation, not the rest of the bureau.

“The agents are furious with what’s going on, I know that for a fact,” he said.