Former Deputy Attorney General Sally Yates Sally Caroline YatesButtigieg, former officials added to Biden's transition team The Hill's 12:30 Report: Delegates stage state-centric videos for the roll call Trump fires back at Yates for convention speech: 'Terrible AG' MORE warned Thursday that the "moral fiber" of America is in danger from the "unapologetic racism" President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE has unleashed in his attacks on four minority congresswomen.

In a pair of tweets, the former Justice Department official quoted Edmund Burke and warned that those who did not stand up to Trump over his slams on the four lawmakers would bear responsibility for enabling them.

“'The only thing necessary for the triumph of evil is for good men to do nothing.' Edmund Burke. Standing idly by as the moral fiber of our country is shredded by unapologetic racism may seem politically expedient to some, but it is ruinous for our nation," she tweeted.

And those who could have stood up but cowered instead bear equal responsibility for the vile devolution of our country’s values. — Sally Yates (@SallyQYates) July 18, 2019

Yates, who served in the Obama administration and briefly under Trump, was fired by the president for refusing to defend in court his ban on travel from several Muslim-majority countries.

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The House voted on mostly party lines Tuesday to condemn as racist the president's tweets aimed at Democratic Reps. Ilhan Omar Ilhan OmarOmar 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?' Democrats scramble on COVID-19 relief amid division, Trump surprise MORE (Minn.), 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 (N.Y.), 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 (Mich.) and Ayanna Pressley Ayanna PressleyFauci, 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?' Pressley applauded on House floor after moving speech on living with alopecia MORE (Mass.).

Trump defended his tweets at a rally Wednesday night even as the crowd dissolved into chants of "send her back!" aimed at Omar.

“The leading voices of the Democrat Party are left-wing extremists who reject everything our nation stands for,” Trump said Wednesday night. “These left-wing ideologues see our nation as a force of evil.”