Sen. Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (D-Mass.) said on Wednesday that Attorney General William Barr Bill BarrHarris faces pivotal moment with Supreme Court battle Hillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE should resign over his handling of 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 report.

“AG Barr is a disgrace, and his alarming efforts to suppress the Mueller report show that he's not a credible head of federal law enforcement. He should resign,” Warren, who is seeking her party’s presidential nomination, said in a tweet.

AG Barr is a disgrace, and his alarming efforts to suppress the Mueller report show that he's not a credible head of federal law enforcement. He should resign—and based on the actual facts in the Mueller report, Congress should begin impeachment proceedings against the President. — Elizabeth Warren (@ewarren) May 1, 2019

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Warren’s calls for Barr to resign came as he testified before the Senate Judiciary Committee about his handling of the report on Mueller’s investigation on Russian meddling in the 2016 election and the Trump campaign.

House Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffPelosi, Democrats unveil bills to rein in alleged White House abuses of power Chris Matthews ripped for complimenting Trump's 'true presidential behavior' on Ginsburg Trump casts doubt on Ginsburg statement, wonders if it was written by Schiff, Pelosi or Schumer MORE (D-Calif.) and former Housing and Urban Development Secretary Julián Castro, also a Democratic 2020 White House hopeful, have also called for Barr to step down.

The attorney general is facing fierce political blowback over a letter, which was first reported on Tuesday evening by The Washington Post, that Mueller sent Barr saying his March 24 memo did not "capture the context, nature, and substance" of his findings on Russia's election interference and the Trump campaign.

"There is now public confusion about critical aspects of the results of our investigation. This threatens to undermine a central purpose for which the Department appointed the Special Counsel: to assure full public confidence in the outcome of the investigations," Mueller wrote in the letter, according to the Post.

Though a Department of Justice spokesperson said Mueller told Barr that nothing in his memo was “inaccurate or misleading,” Democrats have seized on Mueller’s letter as an example of Barr misrepresenting the contents of Mueller’s report.

Senate Minority Leader Charles Schumer Chuck SchumerCruz blocks amended resolution honoring Ginsburg over language about her dying wish Senate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' MORE (D-N.Y.) blasted Barr from the Senate floor as “awful” at this job.

Sen. Chris Van Hollen Christopher (Chris) Van HollenCongress must finish work on popular conservation bill before time runs out Democrats fear Russia interference could spoil bid to retake Senate Mid-Atlantic states sue EPA over Chesapeake Bay pollution MORE (D-Md.) also demanded on Tuesday night that Barr resign.

“For anyone out there who still doubted it, Mueller’s letter shows that Attorney General Barr has always been the chief propagandist for 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,” Van Hollen tweeted. “His four page letter totally misled Congress and the public. He should resign immediately.”