A group of House Democrats 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 cancel his planned press conference Thursday morning ahead of the release 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.

“The Department of Justice announced today that the Attorney General will hold a press conference tomorrow morning before Congress has even seen Special Counsel Mueller’s report," they said in a statement.

"This press conference, which apparently will not include Special Counsel Mueller, is unnecessary and inappropriate, and appears designed to shape public perceptions of the report before anyone can read it," they continued.

JUST IN: House Chairs Demand AG Barr Cancel Press Conference on Mueller Report. #ReleaseTheReporthttps://t.co/tdf7RJPkrK — House Judiciary Dems (@HouseJudiciary) April 18, 2019

The statement was signed by 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 (N.Y.), Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffPelosi, Democrats unveil bills to rein in alleged White House abuses of power Chris Matthews ripped for complimenting Trump's 'true presidential behavior' on Ginsburg Trump casts doubt on Ginsburg statement, wonders if it was written by Schiff, Pelosi or Schumer MORE (Calif.), Oversight and Reform Committee Chairman Elijah Cummings Elijah Eugene CummingsBlack GOP candidate accuses Behar of wearing black face in heated interview Overnight Health Care: US won't join global coronavirus vaccine initiative | Federal panel lays out initial priorities for COVID-19 vaccine distribution | NIH panel: 'Insufficient data' to show treatment touted by Trump works House Oversight Democrats to subpoena AbbVie in drug pricing probe MORE (Md.), Financial Services Committee Chairwoman Maxine Waters Maxine Moore WatersPowell, Mnuchin stress limits of current emergency lending programs Pelosi: House will stay in session until agreement is reached on coronavirus relief Omar invokes father's death from coronavirus in reaction to Woodward book MORE (Calif.), and Committee on Foreign Affairs Chairman Eliot Engel Eliot Lance EngelHouse panel halts contempt proceedings against Pompeo after documents turned over Engel subpoenas US global media chief Michael Pack The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (N.Y.).

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Barr is slated to hold a press conference with 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 on Thursday morning to discuss Mueller's findings from his investigation into Russian election interference and 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.

Democratic lawmakers have slammed the news conference as a way to spin the findings of Mueller's investigation before the public has seen the full report, which is reportedly 400 pages long.

The House Democrats also expressed concerns over a report in The New York Times Wednesday that said Justice Department officials have already briefed the White House on Mueller's report.

The newspaper reported Wednesday night that DOJ officials have had "numerous conversations" with the Trump administration, and that the discussions have allowed for the president's legal team to prepare a rebuttal to Mueller's report.

"There is no legitimate reason for the Department to brief the White House prior to providing Congress a copy of the report," the Democrats said.

"These new actions by the Attorney General reinforce our concern that he is acting to protect President Trump. The Attorney General previously stated, 'I do not believe it would be in the public’s interest for me to attempt to summarize the full report or to release it in serial or piecemeal fashion.' We agree," they added.

"He should let the full report speak for itself," the chairmen continued. "The Attorney General should cancel the press conference and provide the full report to Congress, as we have requested. With the Special Counsel’s fact-gathering work concluded, it is now Congress’ responsibility to assess the findings and evidence and proceed accordingly."

Mueller concluded in March his 22-month-long investigation into Russian election interference and whether the Trump campaign coordinated with Moscow in the run up to the 2016 presidential election. Barr said in a four-page summary to Congress that Mueller did not uncover sufficient evidence to conclude coordination or conspiracy between the Trump campaign and Russia.

Barr's summary said Mueller did not implicate or exonerate the president on the matter of obstruction of justice. Many lawmakers have called for the release of the full report in the weeks since Barr sent his summary to Congress.

The report is scheduled to be sent to Congress with redactions after Barr's press conference.