House Speaker Nancy Pelosi Nancy PelosiHoyer: House should vote on COVID-19 aid — with or without a bipartisan deal Ruth Bader Ginsburg lies in repose at Supreme Court McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE (D-Calif.) said Monday that Attorney General William Barr Bill BarrHarris faces pivotal moment with Supreme Court battle Hillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE would be “obstructing Congress” if he fails to appear before the House Judiciary Committee this week, according to The Associated Press.

Barr is set to testify Thursday about 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’s findings, but has clashed with committee leadership on whether he will respond to a round of questioning from staffers.

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In response, Pelosi said Barr cannot “tell the committee how to conduct its interviews,” according to the AP.

“The attorney general of the United States is not the president’s personal lawyer, and he should act as the attorney general of the United States and honor his responsibilities,” she said.

On Sunday, Barr warned House Democrats that he might not appear before the panel if they did not change the proposed format for the hearing.

“The Attorney General agreed to appear before Congress. Therefore, Members of Congress should be the ones doing the questioning," Justice Department spokeswoman Kerri Kupec said Sunday. "He remains happy to engage with Members on their questions regarding the Mueller report."

Mueller’s report was released in redacted form April 19, but House Democrats have subpoenaed the Justice Department for the full, unredacted version and contributing evidence. Democrats have accused Barr of misrepresenting the findings of the Mueller report in his summary of the report to lawmakers, and in remarks at a press conference ahead of the report's release.

Pelosi's comments echoed those of 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.), who said Sunday, "The witness is not going to tell the committee how to conduct its hearing, period."

Nadler also threatened to subpoena Barr and "use whatever means we can to enforce the subpoena" if the attorney general refuses to show.