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

House Judiciary Committee Chairman Jerrold NadlerJerrold (Jerry) Lewis NadlerLawmakers prep ahead of impeachment hearing Trump: Fox News 'panders' to Democrats by having on liberal guests Democrats express confidence in case as impeachment speeds forward MORE (D-N.Y.) on Tuesday said Attorney General William BarrWilliam Pelham BarrFive things to watch in Russia probe review Trump, GOP shift focus from alleged surveillance abuse to Durham Russia probe Trump: Giuliani to deliver report on Ukraine trip to Congress, Barr MORE "must answer" for reports that special counsel Robert MuellerRobert (Bob) Swan MuellerTrump says he'll release financial records before election, knocks Dems' efforts House impeachment hearings: The witch hunt continues Speier says impeachment inquiry shows 'very strong case of bribery' by Trump 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 TrumpLawmakers prep ahead of impeachment hearing Democrats gear up for high-stakes Judiciary hearing Warren says she made almost M from legal work over past three decades 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 PelosiDemocrats gear up for high-stakes Judiciary hearing White House, Democrats strike tentative deal to create Space Force in exchange for federal parental leave benefits: report Trump: Fox News 'panders' to Democrats by having on liberal guests MORE (D-Calif.) and Senate Minority Leader Charles SchumerCharles (Chuck) Ellis SchumerOvernight Health Care — Presented by Johnson & Johnson — Democrats call on Supreme Court to block Louisiana abortion law | Michigan governor seeks to pause Medicaid work requirements | New front in fight over Medicaid block grants House, Senate Democrats call on Supreme Court to block Louisiana abortion law Why a second Trump term and a Democratic Congress could be a nightmare scenario for the GOP 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.