Key Dates in the Mueller investigation

Former FBI director Robert Mueller was appointed on May 17, 2017 as special counsel to lead the investigation into links between President Donald Trump's election campaign and Russia. One year later, Mueller's team has interviewed scores of witnesses, including top White House officials, and issued 22 indictments, and the inquiry shows no sign of ending. May 17: Mueller, 73, is named to take over a year-old investigation into possible collusion between the Trump campaign and Russia in the 2016 election.