Attorney General William Barr Bill BarrBiden rips Barr's comments on coronavirus restrictions as 'sick' OVERNIGHT ENERGY: Cheney asks DOJ to probe environmental groups | Kudlow: 'No sector worse hurt than energy' during pandemic | Trump pledges 'no politics' in Pebble Mine review Cheney asks DOJ to probe environmental groups MORE has agreed to give testimony before the House Judiciary Committee next month amid growing questions over the administration's alleged interference in the criminal case of a close ally of President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE.

Democrats on the panel released a letter Wednesday confirming Barr’s March 31 appearance, saying they are concerned the agency has become politicized under his watch.

“In the interest of transparency, we wish to be candid about one set of concerns we plan to address at the hearing. Since President Trump took office, we have repeatedly warned you and your predecessors that the misuse of our criminal justice system for political purposes is both dangerous to our democracy and unacceptable to the House Judiciary Committee,” they wrote.

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The hearing’s announcement comes amid heightened scrutiny over Barr and the Department of Justice (DOJ) amid Democrats’ concerns that President Trump is influencing the agency.

Barr's appearance comes after the DOJ asked a federal court to sentence longtime Trump adviser Roger Stone Roger Jason StoneJustice IG investigating Stone sentencing: report Romney says Trump's protest tweets 'clearly intended to further inflame racial tensions' Bannon trial date set in alleged border wall scam MORE to "far less" than the seven to nine years department prosecutors had recommended just a day earlier.

The DOJ request came after the president criticized the first sentencing guidance on Twitter as a “horrible and very unfair situation,” leading some Democrats to accuse the DOJ of taking its cues from the White House.

“This situation has all the indicia of improper political interference in a criminal prosecution,” Senate Minority Leader Charles Schumer Chuck SchumerMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security Warren, Schumer introduce plan for next president to cancel ,000 in student debt Schumer lashes out at Trump over 'blue states' remark: 'What a disgrace' MORE (D-N.Y.) said in a letter this week to Justice Department Inspector General Michael Horowitz.

Three of the prosecutors who recommended the longer sentence withdrew from the case on Tuesday, while another resigned from the department.

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Democrats on the Judiciary Committee also said they have concerns over Barr’s decision to create a process through which Rudy Giuliani Rudy GiulianiGrand jury adds additional counts against Giuliani associates Lev Parnas and and Igor Fruman Juan Williams: Breaking down the debates Giuliani criticizes NYC leadership: 'They're killing this city' MORE can provide information to the Justice Department from his personal investigations.

“In your tenure as Attorney General, you have engaged in a pattern of conduct in legal matters relating to the President that raises significant concerns for this Committee. In the past week alone, you have taken steps that raise grave questions about your leadership of the Department of Justice,” the Democrats wrote.

“These are not the only issues that our Committee intends to discuss with you when you appear, but they are enough to require our immediate attention,” the wrote.

Barr’s hearing will take place in the aftermath of this month’s acquittal of Trump in the Senate’s impeachment investigation. Democrats have vowed to investigate the administration over new leads of possible wrongdoing or continue with probes that were already underway before the impeachment proceedings ground Washington to a halt.

“Donald Trump, I still believe, is a one-man crime wave, and we can’t let him get away with all of his other offenses against the Constitution and the people,” Rep. Jamie Raskin Jamin (Jamie) Ben RaskinShakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' Trump payroll-tax deferral for federal workers sparks backlash Congress must enact a plan to keep government workers safe MORE (D-Md.), a member of the House Judiciary Committee, told The Hill last week.

Updated at 4:13 p.m.