Democrats are telling Attorney General William Barr to resign, following the news reports that indicate the special counsel Robert Mueller had misgivings about Barr's characterization of his report on the Russia investigation.

Mueller reportedly wrote a letter saying that Barr and his four-page summary of the Russia investigation "did not fully capture the context, nature, and substance of this office's work and conclusions."

Barr concluded in his summary that Trump did not obstruct justice — despite Mueller being unable to draw a conclusion on the matter, and numerous potential examples of obstruction.

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Democrats are incensed at Attorney General William Barr following news reports that indicate the special counsel Robert Mueller had misgivings about Barr's characterization of its Russia investigation.

On Tuesday, The New York Times first reported that the special counsel wrote to Barr saying he disagreed with the attorney general's summary of its nearly two-year investigation.

Days after Barr submitted his "principal conclusions" on the investigation, Mueller wrote a letter saying he "did not fully capture the context, nature, and substance of this office's work and conclusions," according to The Washington Post.

"There is now public confusion about critical aspects of the results of our investigation," the letter continued. "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."

Read more: Video shows William Barr denying knowledge of Mueller's objections to his summary of the Russia probe days after Mueller sent him a letter about it

In March, Barr summarized Mueller's 448-page report with a four-page letter. In the summary, Barr deduced that the special counsel could not prove a conspiracy between members of Donald Trump's 2016 presidential campaign and Russia.

Barr also concluded in the summary that Trump did not obstruct justice — despite Mueller being unable to draw a conclusion on the matter and numerous potential examples of obstruction that lawmakers have scrutinized.

21 PHOTOS William Barr announces Mueller report release See Gallery William Barr announces Mueller report release Attorney General William Barr speaks alongside Deputy Attorney General Rod Rosenstein, right, and acting Principal Associate Deputy Attorney General Edward O'Callaghan, left, about the release of a redacted version of special counsel Robert Mueller's report during a news conference, Thursday, April 18, 2019, at the Department of Justice in Washington. (AP Photo/Patrick Semansky) Special counsel Robert Mueller's report, with redactions, as released on Thursday, April 18, 2019, is photographed in Washington. (AP Photo/Jon Elswick) Four pages of special counsel Robert Mueller report on the witness table in the House Intelligence Committee hearing room on Capitol Hill, in Washington, Thursday, April 18, 2019.. (AP Photo/Cliff Owen) Special counsel Robert Mueller's redacted report on Russian interference in the 2016 presidential election as released on Thursday, April 18, 2019, is photographed in Washington. (AP Photo/Jon Elswick) Attorney General William Barr speaks alongside Deputy Attorney General Rod Rosenstein, right, and acting Principal Associate Deputy Attorney General Edward O’Callaghan, left, about the release of a redacted version of special counsel Robert Mueller's report during a news conference, Thursday, April 18, 2019, at the Department of Justice in Washington. (AP Photo/Patrick Semansky) Attorney General William Barr speaks alongside Deputy Attorney General Rod Rosenstein, right, about the release of a redacted version of special counsel Robert Mueller's report during a news conference, Thursday, April 18, 2019, at the Department of Justice in Washington. (AP Photo/Patrick Semansky) The four page letter from Attorney General William Barr regarding special counsel Robert Mueller's redacted report is photographed Thursday, April 18, 2019, in Washington. (AP Photo/Jon Elswick) Special Counsel Robert Mueller's redacted report that includes written answers from President Donald Trump as released on Thursday, April 18, 2019, is photographed in Washington. (AP Photo/Jon Elswick) Special Counsel Robert Mueller's redacted report that includes written answers from President Donald Trump as released on Thursday, April 18, 2019, is photographed in Washington. (AP Photo/Jon Elswick) Photojournalists photograph four pages of report by special counsel Robert Mueller on the witness table in the House Intelligence Committee hearing room on Capitol Hill, in Washington, Thursday, April 18, 2019. (AP Photo/Cliff Owen) UNSPECIFIED - In this screenshot taken from the U.S. Department of Justice website, a page from the Mueller Report is seen on April 18, 2019. (Photo by Getty Images) UNSPECIFIED - In this screenshot taken from the U.S. Department of Justice website, a redacted page from the Mueller Report is seen on April 18, 2019. (Photo by Getty Images) UNITED STATES - APRIL 18: The gavel of chairman Jerrold Nadler, D-N.Y., is seen as media films a few pages of special counsel Robert Mueller's report on Russian interference in the 2016 election which was printed out by staff in the House Judiciary Committee's hearing room on Thursday, April 18, 2019. (Photo By Tom Williams/CQ Roll Call) UNITED STATES - APRIL 18: Attorney General William Barr appears on a television in the Capitol subway to Rayburn building while conducting a news conference at the Justice Department on special counsel Robert Mueller's report on Russian interference in the 2016 election on Thursday, April 18, 2019. (Photo By Tom Williams/CQ Roll Call) WASHINGTON, DC - APRIL 18: TV crews work outside of the Senate Judiciary Committee's office on Capitol Hill in Washington, D.C. on April 18, 2019. Today the Department of Justice released special counsel Robert Mueller’s redacted report on Russian election interference in the 2016 U.S. presidential election. (Photo by Zach Gibson/Getty Images) WASHINGTON, DC - APRIL 18: TV crews work outside of the Senate Judiciary Committee's office on Capitol Hill in Washington, D.C. on April 18, 2019. Today the Department of Justice released special counsel Robert Mueller’s redacted report on Russian election interference in the 2016 U.S. presidential election. (Photo by Zach Gibson/Getty Images) A photo illustration dated April 18, 2019 in Washington, DC shows an editor looking at a photograph of US Attorney General William Barr (L) speaking about the release of the redacted version of the Mueller report, juxtaposed with US President Donald Trump's latest tweet (R) 'Game Over,' using a 'Game of Thrones' style montage that pictures him standing in dramatic fog. - Trump, backed by his attorney general, declared himself fully vindicated Thursday in the investigation into Russian election meddling and alleged collusion with his campaign -- even before the American people and lawmakers see the full probe report. (Photo by Eva HAMBACH / AFP) (Photo credit should read EVA HAMBACH/AFP/Getty Images) William Barr, U.S. attorney general, center, speaks as Rod Rosenstein, deputy attorney general, right, and Ed O'Callaghan, principal deputy assistant Attorney General, listen during a news conference at the U.S. Department of Justice (DOJ) in Washington, D.C., U.S., on Thursday, April 18, 2019. Barr is set to release a redacted version of Special Counsel Robert Mueller's final report today, and the document could leave everyone unsatisfied, President Donald Trump, lawmakers and the public. Photographer: Erik Lesser/Pool via Bloomberg William Barr, U.S. attorney general, left, speaks as Rod Rosenstein, deputy attorney general, listens during a news conference at the U.S. Department of Justice (DOJ) in Washington, D.C., U.S., on Thursday, April 18, 2019. Barr is set to release a redacted version of Special Counsel Robert Mueller's final report today, and the document could leave everyone unsatisfied, President Donald Trump, lawmakers and the public. Photographer: Erik Lesser/Pool via Bloomberg US Deputy Attorney General Rod Rosenstein (R) listens while Attorney General William Barr speaks during a press conference about the release of the Mueller Report at the Department of Justice April 18, 2019, in Washington, DC. - US Attorney General Bill Barr said Thursday that the White House fully cooperated with Special Counsel Robert Mueller's probe of Russian election meddling and that President Donald Trump took no action to thwart the probe. 'There is substantial evidence to show that the president was frustrated and angered by a sincere belief that the investigation was undermining his presidency, propelled by his political opponents, and fueled by illegal leaks,' Barr said ahead of the release of the Mueller report. (Photo by Brendan Smialowski / AFP) (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images) US Deputy Attorney General Rod Rosenstein (R) listens while Attorney General William Barr speaks during a press conference about the release of the Mueller Report at the Department of Justice April 18, 2019, in Washington, DC. - US Attorney General Bill Barr said Thursday that the White House fully cooperated with Special Counsel Robert Mueller's probe of Russian election meddling and that President Donald Trump took no action to thwart the probe. 'There is substantial evidence to show that the president was frustrated and angered by a sincere belief that the investigation was undermining his presidency, propelled by his political opponents, and fueled by illegal leaks,' Barr said ahead of the release of the Mueller report. (Photo by Brendan Smialowski / AFP) (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images) Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

Following the reports of Mueller's frustration, Democratic lawmakers have amped their calls for Barr to resign. Sen. Van Hollen referenced a previous Senate hearing on Barr's principal conclusions.

"I asked Barr, 'Did Bob Mueller support your conclusion?' His answer was, 'I don't know whether Mueller supported my conclusion,'" Van Hollen said on Twitter.

"We now know Mueller stated his concerns on March 27th, and that Barr totally misled me, the Congress, and the public," Van Hollen added. "He must resign."

Rep. Maxine Waters said during an MSNBC interview on Tuesday: "I think that Barr should resign. And if he does not resign, he should be facing impeachment proceedings also. He has abdicated on his responsibility. He has lied, he has used the very words coming right out of the president's mouth: 'no collusion.'

"It is outrageous and he needs to go."

Rep. Ro Khanna, a member of the House Oversight Committee, said on Twitter. "He needs to resign tomorrow. At some point we need to distinguish fact from spin."

Rep. Ted Lieu said on Twitter: "Why would Bill Barr flush his reputation & credibility down the toilet? I don't care, what we should care about is that he is still in charge of [the Justice Department].

"Bill Barr should resign and then apply to be the next White House press secretary, where he can lie all he wants."

Lieu also said he wants to hold a hearing and interview Mueller. The attorney general is scheduled to testify before the Senate Judiciary Committee on Wednesday.

"We certainly want to give Bill Barr the opportunity to perjure himself," Lieu said during a CNN interview on Tuesday. "But we're also going to want to hear from Robert Mueller.

"But at this point, based on what I know, Bill Barr needs to resign," he added on CNN. "He took an oath to the Constitution, not to Donald Trump. He is supposed to be America's attorney, not Trump's stooge."

Sen. Mazie Hirono said during an MSNBC interview on Tuesday: "Clearly Barr has lied to both the House and Senate Committees. It's a lie, let's call it what it is."

Hirono described Barr's description of Mueller's report as "spin" and accused him of "acting like the president's lawyer."

She also called on the Justice Department's inspector general to investigate whether Barr "misled the public to protect [Trump].

Rep. Kathleen Rice tweeted: "[Attorney General] Barr clearly and deliberately misled the American people about the results of the Special Counsel's investigation – more than once. He needs to resign or be impeached."

Former Housing and Urban Development secretary Julián Castro tweeted: "Attorney General Barr willfully misled the American people to cover up attempted crimes by Donald Trump. He should resign his position or face an impeachment inquiry immediately."

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