A former FBI official said Sunday that Bill and Hillary ClintonHillary Diane Rodham ClintonTrump mocks 'elites' at campaign rally Trump backs down in rare reversal Election Countdown: Family separation policy may haunt GOP in November | Why Republican candidates are bracing for surprises | House Dems rake in record May haul | 'Dumpster fire' ad goes viral 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 TrumpFamily immigration detention centers could be at capacity within days: report Trump likely to meet with Putin in July: report DOJ requests military lawyers to help prosecute immigration crimes: report 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.