Sen. Mazie Hirono Mazie Keiko HironoManchin defends Supreme Court candidate Barrett: 'It's awful to bring in religion' Democrats shoot down talk of expanding Supreme Court Democrats unveil plan declaring racism a public health issue MORE (D-Hawaii) on Wednesday excoriated 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 during a hearing before the Senate Judiciary Committee, accusing the country's top law enforcement official of sacrificing his reputation in service to President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE.

Hirono accused Barr of lying to lawmakers, compared him to Trump's closest allies and told the attorney general: "You should resign."

"Mr. Barr, now the American people know that you are no different from Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE or Kellyanne Conway Kellyanne Elizabeth ConwaySpecial counsel investigating DeVos for potential Hatch Act violation: report George and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death MORE or any of other people who sacrifice their once decent reputation for the grifter and liar who sits in the Oval Office," Hirono said.

Sen. Mazie Hirono to Attorney General William Barr: "Now we know more about your deep involvement in trying to cover up for Donald Trump ... America deserves better. You should resign" https://t.co/UyviQ1DWt6 pic.twitter.com/jOqsQv5uXT — ABC News Politics (@ABCPolitics) May 1, 2019

She spent the bulk of her time for questioning delivering a searing monologue in which she blasted Barr over his handling of the Russia investigation, including a memo he sent to the special counsel about the investigation prior to serving as attorney general, and his four-page summary of 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.

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Barr's testimony comes amid scrutiny from Democrats of his handling of Mueller's investigation into Russian interference in the 2016 election. On Tuesday, a Justice Department spokeswoman said that Mueller had expressed “frustration” to Barr in March over Barr's four-page memo describing the investigation’s findings.

Hirono accused Barr of lying to lawmakers when he said he was unaware of Mueller's concerns with the attorney general's four-page summary of the investigation.

"You used every advantage of your office to create the impression that the president was cleared of misconduct," Hirono said. "You put the power and authority of the office of the attorney general and the Department of Justice behind a public relations effort to help Donald Trump protect himself."

She added that she "wasn't surprised" by what she described as Barr's efforts to protect the president, and said that was the reason she joined other Democrats in voting against his confirmation.

“Now we know more about your deep involvement in trying to cover up for Donald Trump,” Hirono said Wednesday. “Being attorney general … is a sacred trust. You have betrayed that trust, America deserves better. You should resign.”

Hirono went on to press Barr on whether he believes it’s “OK” for the president to act as he did in episodes detailed in the Mueller report. The report listed 10 "episodes" that Mueller's team examined for possible obstruction of justice.

As Hirono continued tearing into Barr, Senate Judiciary Committee Chairman 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.) stepped in to cut off the senator's questioning.

"You’ve slandered this man," Graham said.

"I do not think I am slandering anyone," Hirono replied.

After Hirono calls on Barr to resign, @LindseyGrahamSC interrupts her and angrily accuses her of "slandering" Barr pic.twitter.com/TE76l2hrd3 — Aaron Rupar (@atrupar) May 1, 2019

"I gave you seven minutes and you slandered this man from top to bottom," Graham interjected forcefully. "If you want more of this you're not going to get it. If you want to ask him questions you can."

“You certainly have your opinion and I have mine,” Hirono responded as Sen. Marsha Blackburn Marsha BlackburnTaylor Swift on National Voter Registration Day: 'We need everyone' Democrats smell blood with new DHS whistleblower complaint Hillicon Valley: Election officials prepare for new Russian interference battle | 'Markeyverse' of online fans helps take down a Kennedy | GOP senators unveil bill to update tech liability protections MORE (R-Tenn.) began her line of questioning.

Hirono has emerged as one of the Trump administration's most outspoken critics, and was one of the most forceful questioners during the Judiciary Committee's hearing last year with Supreme Court nominee Brett Kavanaugh Brett Michael KavanaughHarris faces pivotal moment with Supreme Court battle Poll: 59 percent think president elected in November should name next Supreme Court justice Feinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight MORE, who was accused of sexual misconduct.