Dem lawmaker: Mueller must resign so he can testify 'free' from Barr's 'control'

Rep. Steve CohenStephen (Steve) Ira CohenPelosi throws cold water on impeaching Barr Justice Department officials say decisions are politicized Congress must act on police reform, don't let opponents divert the conversation MORE (D-Tenn.), a vocal critic of President TrumpDonald John TrumpDeSantis on Florida schools reopening: 'If you can do Walmart,' then 'we absolutely can do schools' NYT editorial board calls for the reopening of schools with help from federal government's 'checkbook' Mueller pens WaPo op-ed: Roger Stone 'remains a convicted felon, and rightly so' MORE, is calling on special counsel Robert MuellerRobert (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 to resign from the Justice Department in order to "free himself" from Attorney General William BarrBill BarrGOP senator says Trump commuting Stone was a 'mistake' Barr recommended Trump not give Stone clemency: report Trump commutes Roger Stone's sentence MORE's "control" and testify before Congress.

"Mueller must resign from 'Justice', free himself of Barr’s control, and explain the #MuellerReport and the truth about Trump and #ObstructionOfJustice," Cohen tweeted Tuesday night.

His call comes hours after reports that Mueller wrote a letter to Barr in late March expressing "frustration" with the way the attorney general detailed the special counsel's conclusions in the investigation into Russia's election interference.

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The Washington Post first broke the story that Mueller had sent the letter, which came days after Barr delivered a four-page memo to Congress in which he stated that the special counsel had not found sufficient evidence of conspiracy between the Trump campaign and Russia. Additionally, Barr said he and Deputy Attorney General Rod RosensteinRod RosensteinSupreme Court to hear dispute over Democrats' access to Mueller materials Republicans release newly declassified intelligence document on FBI source Steele GOP's Obama-era probes fuel Senate angst MORE determined that the evidence laid out in the Mueller report did not point to President Trump obstructing the special counsel's investigation.

According to the Post, Mueller subsequently sent a letter to Barr stating that the attorney general's memo "did not fully capture the context, nature, and substance of this office’s work and conclusions."

A Justice Department official later confirmed to The Hill that Mueller had "expressed frustration over the lack of context and the resulting media coverage" in his letter to Barr.

The revelation came just a day before Barr is set to answer questions from the Senate Judiciary Committee. At least one Democratic senator, Sen. Chris Van HollenChristopher (Chris) Van HollenMaryland GOP governor who's criticized Trump says he's considering 2024 presidential run Communist China won't change — until its people and the West demand it Senate passes sanctions bill targeting China over Hong Kong law MORE of Maryland, has already called on Barr to resign. And key Democratic leaders on Capitol Hill, including Senate Minority Leader Charles SchumerChuck SchumerDemocrats blast Trump for commuting Roger Stone: 'The most corrupt president in history' A renewed emphasis on research and development funding is needed from the government Data shows seven Senate Democrats have majority non-white staffs MORE (N.Y.) and House Judiciary Committee Chairman Jerrold NadlerJerrold (Jerry) Lewis NadlerNadler: Barr dealings with Berman came 'awfully close to bribery' Nadler wins Democratic primary Voters must strongly reject the president's abuses by voting him out this November MORE (N.Y.), have issued new calls for Mueller to testify. 

Cohen has been one of the most vociferous critics of Trump on Capitol Hill, calling the president "the most despicable human being to ever reside in 1600 Pennsylvania Ave.," referring to the White House. He sponsored articles of impeachment against Trump in November 2017.