The special counsel, Robert Mueller III, sent a confidential report Friday to U.S. Attorney General William Barr on the investigation into Russian interference in the 2016 election, capping a nearly two-year probe that has cast a cloud over the Trump administration and secured the convictions of prominent figures on the president’s campaign and in his orbit.

Barr now must decide how much, if anything, to make publicly available. The attorney general can expect enormous public pressure from congressional Democrats and other advocates to release the report in full.