U.S. Attorney General William Barr plans on Thursday morning to release a redacted version of Special Counsel Robert Mueller's report on alleged Russian interference in the 2016 U.S. election and contacts between Moscow and U.S. President Donald Trump's campaign, the Justice Department said on Monday.

Department spokesperson Kerri Kupec did not provide a precise time, but said the report, which Barr has described as nearly 400 pages long, will be released both to Congress and the public. Congressional Democrats have demanded the release of the full report with nothing blacked out and also have asked for the underlying evidence gathered by Mueller, meaning Thursday's action by Barr may be just the first move in a longer fight that could play out in the courts.

Moments after the department announced its plans for releasing the report, the Republican president went to Twitter to make another attack on Mueller's team and derided the “Russia Hoax.” The Mueller investigation has cast a cloud over the presidency of Trump, who has often called it a politically motivated “witch hunt.”

Mueller turned over a copy of his confidential report to Barr on March 22, ending his 22-month-long inquiry. Two days later, Barr released a four-page letter summarizing what he said were Mueller's primary conclusions. In that letter to Congress, Barr said Mueller's investigation did not establish that members of Trump's election campaign conspired with Russia.

Barr also wrote that Mueller presented evidence “on both sides” about whether Trump obstructed justice by acting to impede the inquiry, but he did not draw a conclusion one way or the other. Barr said that he reviewed Mueller's evidence and made his own determination that Trump did not commit the crime of obstruction of justice.