Former President Nixon's White House counsel, John Dean, delivered a sharp public rebuke of President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE, calling him “evil.”

Dean tweeted early Sunday that Trump makes the “long nightmare” of Watergate “seem like a brief idyllic daydream.”

“History will treat Nixon’s moral failures as relatively less troubling than Trump’s sustained and growing decadence, deviousness and self-delusive behavior,” Dean said. “Nixon=corrupt; Trump=evil.”

Trump’s is making the long nightmare of Nixon’s Watergate seem like a brief idyllic daydream. History will treat Nixon’s moral failures as relatively less troubling than Trump’s sustained and growing decadence, deviousness and self-delusive behavior. Nixon=corrupt; Trump=evil. — John Dean (@JohnWDean) November 4, 2018

The former White House counsel became a key prosecution witness during the Watergate scandal after pleading guilty to one count of obstruction of justice.

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Dean has criticized Trump before, but his comments have largely focused on the special counsel investigation and possible legal troubles plaguing the Trump administration.

In August, Dean tweeted that then-White House counsel Don McGahn was “doing right!” by cooperating with special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE in the Russia investigation.

He followed that up by hitting Trump directly, saying that he doubts the president had “ANY IDEA what McGahn has told Mueller.”

Dean also told Trump: “I still have trouble using the title Mr. President for someone installed by Putin.”

His new comments come just two days before the midterm elections, and days after a week of political violence that had many Trump opponents doubling down on their criticism of the president's rhetoric and attacks on the media and Democrats.