The former national security adviser faces backlash as damning Ukraine book leaks continue.
The former White House communications director also argued the president was "incapable" of empowering his staff.
The book promised to give readers a "definitive insider narrative" of Trump's presidency.
"Whether it's Mulvaney, Bolton, Giuliani, Pompeo—if they have to testify under oath, he has to leave," former White House Communications Director Anthony Scaramucci said on MSNBC.
The former White House communications director said the president's Senate trial could prove too punishing for Trump to withstand.
"I think history will judge them very, very poorly," Anthony Scaramucci said of Republicans.
"He's had 85 people leave the White House and those people are going to start turning on him," the former White House communications director said.
Former White House Press Secretary Anthony Scaramucci appeared on CNN to discuss the book "A Warning" and suggested Trump is senile.
The former White House communications director admitted that his past support for the administration was a mistake.
"He's broken the law systematically, and he's using the forces of his communications skills to discredit people like you and me."
"We know that it's completely impeachable and completely illegal," the former White House communications director said in reference to Trump's actions towards Ukraine.
The former White House communications director said he didn't think Trump would make it to the next election.
"He's a good guy," Anthony Scaramucci argued, but said Mulvaney is "working for a terrible person."
In a tweet, Scaramucci told Trump that "trying to get dirt on" Joe Biden from the Ukraine President is "not like playing a game of 'Telephone' in middle school."
"There's a vacuum of leadership inside the White House," the former White House communications director said.
Scaramucci has turned his very short tenure with the Trump administration into a profitable position for himself.
President Donald Trump's volatile White House is going to get worse, former communications director Anthony Scaramucci told CNN's Don Lemon.
Peter Wehner says he feared for U.S. president's mental state even before he took office.
Former White House communications director tells CNN that Republicans need to step in and stop the U.S. president for the good of the nation.
"The last three days have been an unmitigated disaster for the president," Scaramucci said in an interview about Trump at the G-7 Summit.
Claiming the Mooch is just bitter ignores an obvious fact: He's singing the same tune as other Trump defectors. Note for note.
"I love how these people who work for a rapist have no compunction about making accusations of abuse by someone who criticizes the rapist," Conway tweeted.
The former White House communications chief issued a mea culpa for his time working with the president and says the country's future is at stake.
"One of the first things you have to do is allow them to change their mind," former White House communications diector Anthony Scaramucci said on Fox News Sunday.
President Donald Trump is also "worse than a racist" because he does not have empathy, ex-White House communications director Anthony Scaramucci says.
"You know, you're fracturing the institutions and all of the things that the country stands for," Scaramucci said about Trump.
"We are now in the early episodes of 'Chernobyl' on HBO," Anthony Scaramucci said on Sunday. "The reactor is melting down and the apparatchiks are trying to figure out whether to cover it up or start the clean-up process."
"Recently he has said things that divide the country in a way that is unacceptable," tweeted Scaramucci after Trump claimed the former White House communications director was "totally incapable of handling" the position.
"Like a glacier of support is going to break off and float away from him in a way that he doesn't fully understand," Anthony Scaramucci warned.