Former FBI Director Robert Mueller on Wednesday was named special prosecutor into an investigation of “Russian government efforts to influence the 2016 presidential election, and related matters,” the Justice Department said.

The news comes one day after the New York Times reported that President Donald Trump allegedly asked former FBI Director James Comey to kill the bureau’s investigation into former national security adviser Mike Flynn and two days after it was revealed that Trump revealed highly classified intelligence to Russian officials.

Many Democrats in Washington have been calling for the attorney general’s office to appoint a special prosecutor for months, but those calls became much louder after the Times report on Tuesday, with at least one Republican also calling for a special prosecutor and another mulling the idea of impeachment.