Sen. Brian Schatz Brian Emanuel SchatzCDC causes new storm by pulling coronavirus guidance Overnight Health Care: CDC pulls revised guidance on coronavirus | Government watchdog finds supply shortages are harming US response | As virus pummels US, Europe sees its own spike Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE (D-Hawaii) mocked his Republican colleagues on Tuesday amid reports that 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 was unhappy with Attorney General William Barr’s interpretation of his investigation into Russia's election interference.

“I’m hearing that several senior republicans in Congress are finally fed up and they are quietly planning to do nothing,” Schatz tweeted Tuesday evening.

I’m hearing that several senior republicans in Congress are finally fed up and they are quietly planning to do nothing. — Brian Schatz (@brianschatz) April 30, 2019

Schatz also appeared to call Barr’s summary of the Mueller report “a coverup of the coverup” while criticizing his GOP colleagues who voted to approve Barr and other Trump administration officials.

We now have a coverup of the coverup. — Brian Schatz (@brianschatz) April 30, 2019

Every Republican voted for Barr. Almost every Republican voted for DeVos. Every Republican voted for Zinke. The presidential campaign is important and exciting but the battle for the U.S. Senate is absolutely crucial for the future of our country. — Brian Schatz (@brianschatz) April 30, 2019

Reports surfaced Tuesday night that Mueller voiced frustration to Barr last month, saying Barr's four-page summary to Congress summarizing Mueller's findings lacked context.

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Mueller told Barr that his description of the Russia investigation did not "capture the context, nature, and substance" of the special counsel's findings, The Washington Post reported.

Barr delivered his summary of Mueller’s principal conclusions to leaders in Congress two days after receiving the confidential report from Muller.

Democrats took issues with both Barr’s summary of the findings and his press conference before Mueller's redacted 448-page report was made public.

Friends, we really need a democratic Senate. — Brian Schatz (@brianschatz) May 1, 2019

A Justice Department spokeswoman told The Hill on Tuesday that the special counsel expressed “frustration” to Barr in late March over the lack of context in the attorney general’s four-page memo.