John Dean, who served as President Nixon’s legal counsel during the Watergate scandal, blasted President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE, calling him a “wuss” and a “fake leader.”

Dean took to Twitter Sunday night to rip into Trump with repeated insults, calling him a “coward” and a “frightened person.”

“Trump’s not only incompetent he’s actually a wuss. Like most bullies he’s a coward,” Dean wrote. “As with most autocrats he’s a very frightened person. He’s a fake leader, who thinks nasty is strong.”

Trump’s bitching and whining and complaining is non-stop. The presidency reveals its occupant: Trump’s not only incompetent he’s actually a wuss. Like most bullies he’s a coward. As with most autocrats he’s a very frightened person. He’s a fake leader, who thinks nasty is strong. https://t.co/4YAQkhFv31 — John Dean (@JohnWDean) December 17, 2018

Dean was quote-tweeting Trump, who had taken to the platform to call 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’s investigation into Russian interference in the 2016 election a “witch hunt hoax.”

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Dean has spoken out against Trump several times in recent weeks, calling the president "evil" and saying Trump makes the “long nightmare” of the Watergate scandal “seem like a brief idyllic daydream."

The former White House legal counsel pleaded guilty to one count of obstruction of justice and became a prosecution witness as the Watergate saga played out.

Most of his comments have regarded Mueller’s investigation, although he has recently been taking more shots at Trump directly.

His recent comments come just days after more revelations about Mueller’s investigation become public, including that Trump’s former personal lawyer Michael Cohen is cooperating extensively with the special counsel.