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Activists protest outside the federal courthouse in Alexandria, Va., on July 31, 2018, the first day of the trial of former Trump campaign chairman Paul Manafort.
Updated at 5:32 p.m. ET
Attorney General William Barr received a report by special counsel Robert Mueller on Friday that summed up the findings from Mueller's investigation into the Russian attack on the 2016 presidential election.
Barr notified congressional leaders in a letter that said he is "reviewing the report and anticipate that I may be in a position to advise you of the special counsel's principal conclusions as soon as this weekend."
The letter was addressed to the leaders and ranking members of the House and Senate Judiciary Committees.
Barr also says he intends to consult with Mueller and with Deputy Attorney General Rod Rosenstein "to determine what other information from the report can be released to Congress and the public consistent with the law."
A message from Mueller was delivered earlier this afternoon to Rosenstein and given "within minutes" to Barr, a Justice Department spokeswoman said.
Officials would not characterize the length of Mueller's report but would say it is "comprehensive."
The White House learned about the completion of the report before around 5 p.m. Attorney Emmet Flood in the White House Counsel's office received the notification.
Barr has committed generally before to airing publicly what he gets from Mueller — as much as permitted by the law and regulations.
He may opt to uphold that pledge by releasing a redacted version of what Mueller has prepared, or Barr may write his own report to summarize the confidential findings for public consumption.
Rosenstein was expected to call Mueller to thank him for his work.
Calls start for Mueller report to be public
Sen. Mark Warner, D-Va., the vice chairman of the Senate intelligence committee, renewed calls for Mueller's work to be released. He also said Congress must get access to the report's underlying documents and other materials.
"Congress and the American people deserve to judge the facts for themselves," Warner said. "The special counsel's report must be provided to Congress immediately, and the attorney general should swiftly prepare a declassified version of the report for the public. Nothing short of that will suffice."
Rep. Doug Collins, R-Ga., the ranking member of the House Judiciary Committee, said he agreed.