A former FBI official said Sunday that Bill and Hillary ClintonHillary Diane Rodham ClintonThe Memo: Polls flash warning signs for Trump Polls suggest Sanders may be underestimated 10 declassified Russia collusion revelations that could rock Washington this fall 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 TrumpDonald John Trump Former US ambassador: 'Denmark is not a big fan of Donald Trump and his politics' Senate Democrats push for arms control language in defense policy bill Detroit county sheriff endorses Booker for president 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.