Attorney General William Barr Bill BarrProsecutor says no charges in Michigan toilet voting display Judge rules Snowden to give up millions from book, speeches The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE is set to testify publicly before the House and Senate on Tuesday and Wednesday, giving Democrats an opportunity to raise the pressure on him to release 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 report.

Barr is expected to face questions about his handling of the Mueller investigation and report when he testifies on the Trump administration’s fiscal 2020 budget request.

First, Barr will face a small group of lawmakers on the House Appropriations subcommittee with oversight of the Justice Department, a panel chaired by Rep. José Serrano (D-N.Y.) that boasts seven Democrats and four Republicans.

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The lawmakers are set to hit Barr hard over the Mueller report. In excerpts of her statement issued Monday night, Rep. Nita Lowey Nita Sue LoweyTop House Democrats call for watchdog probe into Pompeo's Jerusalem speech With Biden, advocates sense momentum for lifting abortion funding ban Progressives look to flex their muscle in next Congress after primary wins MORE (D-N.Y.), the chairwoman of the larger Appropriations Committee, criticized Barr for his "unacceptable handling" of the report.

"All we have is your four-page summary letter, which seems to cherry pick from the report to draw the most favorable conclusion possible for the President," Lowey's remarks stated. She said it was "extraordinary" that Barr would evaluate hundreds of pages in findings and "make definitive legal conclusions in less than 48 hours."

"Even for someone who has done this job before, I would argue it is more suspicious than impressive," the remarks state.

Barr may face an even more challenging hearing may come a day later when Barr testifies before a subpanel of the Senate Appropriations Committee. Several lawmakers from the Senate Judiciary Committee sit on that subcommittee, including its chairman, Sen. Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-S.C.), and ranking member, Sen. Dianne Feinstein Dianne Emiel FeinsteinBiden leads Trump by 12 points among Catholic voters: poll Names to watch as Trump picks Ginsburg replacement on Supreme Court McConnell says Trump nominee to replace Ginsburg will get Senate vote MORE (D-Calif.).

Sens. Patrick Leahy Patrick Joseph LeahyBattle over timing complicates Democratic shutdown strategy Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election Top Democrats press Trump to sanction Russian individuals over 2020 election interference efforts MORE (D-Vt.), Christopher Coons Christopher (Chris) Andrew CoonsMurkowski: Supreme Court nominee should not be taken up before election Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Del.) and John Kennedy John Neely KennedyMORE (R-La.) also are on the subpanel. A Leahy aide said Monday that the senator plans to ask about the report and how the Justice Department is reviewing it, making redactions and preparing for its release.

Democrats have been loudly clamoring for the full release of the report and its underlying evidence to Congress since Barr unveiled a four-page summary of Mueller’s core findings two weeks ago that effectively cleared President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE of allegations of criminal collusion and obstruction.

The Mueller report isn’t the only controversy Barr is likely to get asked about either.

Members are also poised to ask about other big-ticket items, such as the Justice Department’s legal challenge to the Affordable Care Act. Barr reportedly argued against the administration’s call for ObamaCare’s total dismantling in the administration’s internal talks.

Barr’s nine-page written House testimony released Monday afternoon unsurprisingly contains no explicit mention of Mueller’s probe. Asked whether Barr would answer questions about the Mueller report or investigation, a Justice Department spokeswoman declined to comment.

Barr could also face questions about a pair of reports last week suggesting that some of Mueller’s investigators were unhappy with the way the attorney general characterized their conclusions in his March 24 letter. According to the reports, Mueller’s team prepared their own summaries of the report that could have been publicly released but were not.

In his four-page letter, Barr summarized what he described as Mueller’s core findings, revealing that the special counsel did not “establish” that associates or members of the Trump campaign coordinated or conspired with the Russian government. Barr also revealed that Mueller declined to make a judgment on whether Trump obstructed justice and that he and Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE reviewed and judged the evidence to be insufficient to accuse the president of obstructing the probe.

Barr’s two days of testimony will punctuate burgeoning calls from congressional Democrats for the immediate release of Mueller’s full report without any redactions.

Barr has said he expects to have a version of Mueller’s report ready to release publicly and to Congress by mid-April, but that it will be redacted to conceal grand jury material, details about ongoing investigations, classified information and material that could impact “peripheral third parties.”

Democrats have accused Barr of trying to withhold information from Congress in order to protect Trump. The House Judiciary Committee in a party-line vote last week authorized its chairman, Rep. Jerrold Nadler Jerrold (Jerry) Lewis NadlerSchumer: '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 House passes bill to protect pregnant workers MORE (D-N.Y.), to subpoena for the full report and underlying evidence if Barr does not meet Democrats’ demands.

“He’s a biased defender of the administration. And he’s entitled to be defending the administration, but he is not entitled to withhold the evidence from Congress,” Nadler said on CBS’s “Face the Nation” on Sunday, asserting that Congress is “entitled” to see Mueller’s report in its entirety.

House Republicans have accused their colleagues of trying to undermine Trump after the conclusion of Mueller’s 22-month probe left them disappointed.

While there is bipartisan support for the release of Mueller’s report, Republicans have accused Nadler and others of recklessly pushing for Barr to hand over grand jury material.

In a letter to Nadler on Monday, committee ranking member Rep. Doug Collins Douglas (Doug) Allen CollinsTrump, Biden tied in Georgia: poll Loeffler paints herself as 'more conservative than Attila the Hun' in new campaign ad Vulnerable GOP incumbents embrace filling Supreme Court seat this year MORE (R-Ga.) encouraged him to ask Mueller to testify in lieu of Barr and argued Nadler would need to launch an impeachment inquiry in order to legally get ahold of the grand jury material in Mueller’s report.

“Perhaps you are loath to begin an impeachment hearing when the facts do not support one,” Collins wrote.

Trump, meanwhile, lashed out at Democrats on Monday, writing in a tweet that they will “never be satisfied, no matter what they get, how much they get, or how many pages they get.”

The central question looming over Washington is whether Barr will release Mueller’s report sometime this week. Lawmakers are set to embark on a 2½week recess beginning Wednesday, meaning the document could very well be released after they leave town.

Regardless, Barr is likely to face renewed congressional scrutiny when members return to D.C. He has already committed to testifying before the House and Senate judiciary committees in early May regarding the Mueller investigation.