Sen. Brian SchatzBrian Emanuel Schatz'Medicare for All' complicates Democrats' pitch to retake Senate Criminal justice reform should extend to student financial aid Booker, Durbin and Leahy introduce bill to ban death penalty MORE (D-Hawaii) mocked his Republican colleagues on Tuesday amid reports that special counsel Robert MuellerRobert (Bob) Swan MuellerTrump calls for probe of Obama book deal Democrats express private disappointment with Mueller testimony Kellyanne Conway: 'I'd like to know' if Mueller read his own report 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.