Attorney General William Barr and Deputy Attorney General Rod Rosenstein will hold a press conference on Thursday at 9:30 am ET to discuss the release of a redacted version of special counsel Robert Mueller's report.

Why it matters: Congress will receive the report around 11 am or 12 pm and release it to the public shortly after, according to House Judiciary Chairman Jerry Nadler. Nearly 2 years after the special counsel was appointed, the public will get its most in-depth glimpse yet into what Mueller found in his investigation into the Trump campaign's ties to Russian interference in the 2016 election.

What they're saying: Nadler and several other Democrats have expressed frustration over a story from the New York Times that the Justice Department has already briefed the White House on the contents of the report. The fact that Congress will not receive the Mueller report until at least an hour after the press conference has further infuriated them.

Democratic House committee chairs released a joint statement on Wednesday evening demanding Barr cancel Thursday's press conference.

"The Department of Justice announced today that the Attorney General will hold a press conference tomorrow morning before Congress has even seen Special Counsel Muller's report. 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.

"In addition, we understand from press reports that the Department of Justice has had 'numerous conversations with lawyers from the White House about the report, which 'have aided the President's legal team as it prepares a rebuttal to the report.'"