Ex-White House aide Anthony Scaramucci Anthony ScaramucciFormer DeVos chief of staff joins anti-Trump group Scaramucci to Lemon: Trump 'doubling down' on downplaying virus 'should scare' viewers Sunday shows - Leaked audio of Trump's sister reverberates MORE is calling on Republicans to speak out against President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's "depredations" in a scorching new opinion article in The Washington Post.

Scaramucci, who for a little more than a week was the White House communications director in 2017, challenged Republicans to "summon the nerve" to speak out against Trump.

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"Defy the culture of fear he has created, and go public with the concerns you readily express in private," he wrote. "Hold on to your patriotism, and help save the country from his depredations."

He also said critics of Trump should give room to former Trump advocates to turn on the president.

"And to members of the so-called resistance, please leave room on the off-ramp for those willing to admit their mistakes," he wrote.

Scaramucci has stepped up his criticism of the president in recent weeks, and Trump has responded in kind, arguing his former aide is a "dope" who had little to do with his presidential campaign or White House.

"Anthony Scaramucci is a highly unstable 'nut job' who was with other candidates in the primary who got shellacked, & then unfortunately wheedled his way into my campaign," Trump wrote in one recent tweet. "I barely knew him until his 11 days of gross incompetence-made a fool of himself, bad on TV. Abused staff, got fired. Wrote a very nice book about me just recently. Now the book is a lie?"

Scaramucci wrote in the Post that it took longer for him than it should have to disavow Trump.

He said the final straw came when Trump said that Reps. Ilhan Omar Ilhan OmarOmar urges Democrats to focus on nonvoters over 'disaffected Trump voters' Omar fires back at Trump over rally remarks: 'This is my country' Trump attacks Omar for criticizing US: 'How did you do where you came from?' MORE (D-Minn.), Rashida Tlaib Rashida Harbi TlaibTrump attacks Omar for criticizing US: 'How did you do where you came from?' George Conway: 'Trump is like a practical joke that got out of hand' Pelosi endorses Kennedy in Massachusetts Senate primary challenge MORE (D-Mich.), Alexandria Ocasio-Cortez Alexandria Ocasio-CortezOn The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline McCarthy says there will be a peaceful transition if Biden wins Anxious Democrats amp up pressure for vote on COVID-19 aid MORE (D-N.Y.) and Ayanna Pressley Ayanna PressleyEnding the Hyde Amendment is no longer on the backburner Fauci, Black Lives Matter founders included on Time's 100 Most Influential People list Trump attacks Omar for criticizing US: 'How did you do where you came from?' MORE (D-Mass.) should "go back" to where they came from even though all four are U.S. citizens and three of them were born in the United States.

He also said he was "appalled by the administration’s child-separation policy" on the southern border and described his ranting about the news media as the “enemy of the people” as dangerous.

He called his break from Trump "difficult and embarrassing."

In previous comments Sunday on Fox News, Scaramucci called for longtime critics of the president on the left to help give former Trump officials and supporters "space" to "allow them to change their mind."

"I would ask the left to let's create an off-ramp for those people because when you’re trying to deprogram people from a cult, one of the first things you have to do is allow them to change their mind, and you have to allow them to have the space to change their mind," he said.