Democrats on the House Judiciary Committee on Wednesday released the letter 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 sent to 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 expressing frustration with Barr's summary of Mueller's Russia investigation.

"The summary letter the Department sent to Congress and released to the public late in the afternoon of March 24 did not fully capture the context, nature, and substance of this Office's work and conclusions," reads the letter signed by Mueller. "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."

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Mueller's office also provided documents it suggested the Department of Justice release to the public to supplement Barr's summary of the full report, which was released with redactions on April 18, several weeks after the summary.

"The Attorney General ultimately determined that it would not be productive to release the report in piecemeal fashion,” a Justice Department spokeswoman told The Hill of the documents provided by Mueller, saying Barr and Mueller discussed the letter in a "cordial" conversation by phone.

BREAKING: Letter from Special Counsel Robert Mueller to Attorney General Barr. pic.twitter.com/oDJm6coP8G — House Judiciary Dems (@HouseJudiciary) May 1, 2019

Barr is testifying before the Senate Judiciary Committee on Wednesday. Watch the live coverage here.

Read the full letter below.