Presumptive GOP nominee Donald Trump resurrected a conspiracy theory from Bill Clinton’s presidency that his wife, Democrat Hillary Clinton, was involved in the death of Vince Foster, deputy White House counsel in the Clinton administration.

Foster was diagnosed with depression and multiple investigations have ruled his 1993 death a suicide, but Trump called the circumstances surrounding his death “very fishy” and the lasting allegations of foul play in some circles “very serious” in a Washington Post story published Monday night.

“He had intimate knowledge of what was going on,” Trump told the Post about Foster’s relationship with the Clintons before his death. “He knew everything that was going on, and then all of a sudden he committed suicide.”

Trump also said about Hillary Clinton: “It’s the one thing with her, whether it’s Whitewater or whether it’s Vince or whether it’s Benghazi. It’s always a mess with Hillary.”

But in his typical fashion, the billionaire mogul claimed he didn’t know enough about Foster’s death to bring it up in the first place.

“I don’t bring [Foster’s death] up because I don’t know enough to really discuss it,” Trump said. “I will say there are people who continue to bring it up because they think it was absolutely a murder. I don’t do that because I don’t think it’s fair.”