Former vice president and 2020 Democratic presidential candidate Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE on Wednesday called for 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 to resign, saying that he had lost the confidence of the American people.

"I think he’s lost the confidence of the American people," Biden told a group of reporters who asked whether Barr should resign. "I think he should," he added, according to a video shared on Twitter.

Biden's campaign did not immediately respond to a request for comment from The Hill.

Barr has faced sustained scrutiny from Democrats for his handling 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 on his investigation into Russian interference and whether 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 obstructed justice.

ADVERTISEMENT

Several 2020 Democratic candidates called for him to resign after it was revealed that Mueller expressed frustration with how Barr initially summarized his investigation in a letter to Congress. Mueller said in a March 27 letter to Barr that the attorney general's memo failed to "fully capture the context, nature, and substance of this office’s work and conclusions."

Barr has faced increasing scrutiny from Democrats since he sent his four-page summary to Congress in March on Mueller's report. The letter was widely lambasted by Democrats, who accused Barr of acting as Trump's personal attorney, rather than the American people's attorney general.

"Barr is a disgrace, and his alarming efforts to suppress the Mueller report show that he's not a credible head of federal law enforcement," Sen. Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (D-Mass.), a fellow 2020 contender, tweeted. "He should resign—and based on the actual facts in the Mueller report, Congress should begin impeachment proceedings against the President."

A number of 2020 hopefuls, including Sens. Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE (D-Calif.), Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.) and Amy Klobuchar Amy KlobucharSocial media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Minn.) grilled the attorney general during his testimony to the Senate Judiciary Committee on his handling of Mueller's report.

Harris and Booker, in addition to Sen. Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (N.Y.), former Housing and Urban Development Secretary Julián Castro and former Rep. Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE (D-Texas), have said Barr should resign.