Sen. Brian SchatzBrian Emanuel SchatzNBA draws bipartisan backlash over China response Federal aid is reaching storm-damaged communities too late Impeachment threatens to drown out everything MORE (D-Hawaii) mocked his Republican colleagues on Tuesday amid reports that special counsel Robert MuellerRobert (Bob) Swan MuellerFox News legal analyst says Trump call with Ukraine leader could be 'more serious' than what Mueller 'dragged up' Lewandowski says Mueller report was 'very clear' in proving 'there was no obstruction,' despite having 'never' read it Fox's Cavuto roasts Trump over criticism of network 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.

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.

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.

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.