John Dean, Nixon’s former White House counsel and a key figure in the Watergate scandal, unleashed on Donald Trump in a tweet Sunday night and called him a “wuss.”

“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,” Dean wrote. “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.”

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’s investigation into Russian interference in the 2016 election a “witch hunt hoax.”

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.

Twitter seemed to agree with Dean:

Definitely a wuss & weak personality. The man is mentally unstable, making him unfit for office. This is the first time in my 48 years of voting I actually think the 25th Amendment applies. This is NOT normal…this is DANGEROUS to our great Nation & the World! https://t.co/FIZ0djkYwF

— Wayne Gerenstein (@GerensteinWayne) December 17, 2018

Seriously. The constant whining from this guy, who claims to be some “tough guy” negotiator, is pathetic. Make America Weak Again, I guess. https://t.co/FYSzkj5KU0

— Alex Duzik (@aduzik) December 17, 2018

This, Ladies & Gentlemen, is from a decent & honorable man who, (although may have or out right did, wrong), but has BEEN there DONE & SEEN that, so listen up. @RealDTrump2k16 has GOT to go along w @SenateGOP ASAP‼️ https://t.co/BWCRSdCxnj

— sheppard (@jimnburbank) December 17, 2018

And when is the last time he did something presidential? All his time seems to be spent watching Fox News, sweating about his future, and tweeting! Does he even know what he is supposed to be doing? There must be pictures somewhere… https://t.co/HymQpuR3Fc

— Aunt Sue (@auntsuesc) December 17, 2018