A former FBI official said Sunday that Bill and Hillary ClintonHillary Rodham Clinton Fox News was Trump voters' top source for election news: Pew Democrats remind Trump that he must govern for all citizens Chelsea Manning's redemption proves how far WikiLeaks has fallen 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 TrumpBipartisan group of mayors asks for immigration reform Obama offers laments and optimism at last presser Overnight Energy: Trump's EPA pick faces Congress | 2016 is the hottest year on record 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.