One of the central figures in the Watergate scandal that took down President Richard Nixon has a warning for President Donald Trump.

John Dean, the White House counsel to Nixon who ultimately cooperated with prosecutors, said Trump could be in big trouble if longtime personal attorney Michael Cohen flips and helps special counsel Robert Mueller.

“I don’t think it is boding well for the president,” Dean told CNN. “It’s clear, as I read the situation, that Michael Cohen is looking for a deal and he is upping the stakes.”

"When I became a witness there was a huge effort to discredit me. It was just my word against Nixon's until the tape came out." -John Dean, who served as WH Counsel to Pres. Nixon during Watergate, weighs in on report Cohen claims Trump knew in advance of 2016 Trump Tower meeting pic.twitter.com/PXrzjwnSS2 — CNN Tonight (@CNNTonight) July 27, 2018

Earlier this week, Cohen released a secret recording of himself and Trump from 2016, which prompted attacks on the attorney from the president and his supporters.

That’s a situation Dean knows well.

“When I became a witness, there was a huge effort to discredit me,” Dean said on CNN. “It was just my word against Nixon’s until the tape came out, and they worked mightily to try to discredit me.”

Dean, who the FBI once called the “master manipulator” of the Watergate cover-up, has long been critical of Trump.

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This article originally appeared on HuffPost.