House Judiciary Committee Chairman Jerrold Nadler Jerrold (Jerry) Lewis NadlerDemocrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-N.Y.) on Tuesday dismissed an "incredibly arrogant" Justice Department directive from the day before to former 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 regarding his forthcoming congressional testimony.

"It’s part of the ongoing coverup by the administration to keep information away from the American people," Nadler said on CNN's "New Day" while discussing the Department of Justice letter to Mueller instructing him to stay within the bounds of his redacted report when addressing a pair of House panels on Wednesday. "I think it’s not going to have a real impact."

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Nadler added that Mueller does not have to comply with the Justice Department's request, saying that he doesn't work for the department.

"And that letter asks things that are beyond the power of the agency to ask even if he still worked for them," he continued.

Mueller is slated to testify about his investigation into Russian election interference and possible obstruction from President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE before the House Judiciary and Intelligence committees. The highly anticipated appearance is expected to last approximately five hours.

“Any testimony must remain within the boundaries of your public report because matters within the scope of your investigation were covered by executive privilege, including information protected by law enforcement, deliberative process, attorney work product, and presidential communications privileges,” Associate Deputy Attorney General Bradley Weinsheimer wrote in the Monday letter to Mueller, according to a copy obtained by The Hill.

“These privileges would include discussion about investigative steps or decisions made during your investigation not otherwise described in the public version of your report."

Mueller has already indicated that he would not go beyond the confines of his report. While making his only public remarks about the investigation in May, the former special counsel said that “the report is my testimony.”

His spokesman, Jim Popkin, has also said that Mueller would stick closely to his report during his testimony.

His appearance before Congress will come months after he wrapped up the nearly two-year probe into Moscow's interference in the 2016 presidential election. The investigation did not find sufficient evidence to conclude a conspiracy between Russia and the Trump campaign took place.

However, the report said that Mueller did not reach a conclusion on whether the president obstructed justice.