Appointment as Special Counsel in Russia probe
On May 17, 2017, Deputy Attorney General Rod Rosenstein appointed Mueller to serve as special counsel to oversee the investigation into Russian interference in the 2016 United States elections, and investigations into alleged ties between Russia and the Donald Trump campaign.
The appointment followed a series of events which included Trump's firing of FBI Director James Comey, and "the disclosure that the president urged Mr. Comey to drop the bureau's investigation into his former national security adviser, Michael T. Flynn."
Robert Mueller was appointed by George W Bush as FBI Director in 2001.