Nadler: Barr 'must answer' for Mueller's objections to letter on probe's findings

House Judiciary Committee Chairman Jerrold NadlerJerrold (Jerry) Lewis NadlerNadler to miss a day of impeachment trial due to wife's cancer treatment Impeachment manager dismisses concerns Schiff alienated key Republican votes: 'This isn't about any one person' Trump defense team signals focus on Schiff MORE (D-N.Y.) on Tuesday said Attorney General William BarrWilliam Pelham Barr DOJ says surveillance of Trump campaign adviser Page lacked evidence Senators press DHS over visa approval for Pensacola naval base shooter Democrats sharpen case on second day of arguments MORE "must answer" for reports that special counsel Robert MuellerRobert (Bob) Swan MuellerSchiff: Trump acquittal in Senate trial would not signal a 'failure' Jeffries blasts Trump for attack on Thunberg at impeachment hearing Live coverage: House Judiciary to vote on impeachment after surprise delay MORE objected to Barr's summarization of the conclusions in the investigation into Russia's election interference.

Nadler's comment comes after The Washington Post reported that Mueller sent Barr a letter in late March expressing concern that Barr did not "fully capture the context, nature, and substance" of the special counsel's probe.

"I have demanded the letter & Barr must answer for this. Mueller must be allowed to testify," Nadler tweeted shortly after the Post published its report, which comes two days before Barr is slated to testify before Congress.

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Mueller reportedly sent the letter to Barr on March 27, shortly after the attorney general sent a memo to lawmakers stating the special counsel didn't find evidence of coordination between President TrumpDonald John TrumpTrump denies telling Bolton Ukraine aid was tied to investigations Former senior Senate GOP aide says Republicans should call witnesses Title, release date revealed for Bolton memoir MORE's 2016 campaign and Russia.

In the letter, Mueller reportedly argues that Barr “did not fully capture the context, nature, and substance of this office’s work and conclusions" in his description of the report's conclusions.

“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,” he wrote, according to the letter obtained by The Washington Post, which called on Barr to release the introductions and executive summaries in the report.

Top Democrats have been highly critical of Barr’s handling of the Mueller report, which was more than 400 pages, alleging he was highly partisan while presenting the findings of the investigation.

Nadler issued a formal request for Mueller to testify earlier this month, echoing the calls of Speaker Nancy PelosiNancy PelosiFormer senior Senate GOP aide says Republicans should call witnesses Democrats step up pressure over witnesses after Bolton bombshell Texas AFL-CIO endorses Cuellar's primary challenger MORE (D-Calif.) and Senate Minority Leader Charles SchumerCharles (Chuck) Ellis SchumerBolton book alleges Trump tied Ukraine aid freeze to Biden investigations: NYT Trump legal team offers brisk opening defense of president Impeachment has been a dud for Democrats MORE (D-N.Y.).

Barr is scheduled to testify before the House Judiciary Committee on Thursday, but it remains unclear whether he will show up due to objections over Democrats' call to allow for a half hour of questioning from committee lawyers in addition to being grilled by the panel’s lawmakers.