Democrats say former Trump White House counsel Don McGahn 'shed new light on several troubling events' in long-awaited testimony

Former Trump White House counsel Don McGahn testified before the House Judiciary Committee Friday about the Mueller investigation.

Former White House counsel Don McGahn appeared before the House Judiciary Committee Friday following a yearslong effort by Congress to enforce a subpoena demanding McGahn's testimony about events related to former special counsel Robert Mueller's Russia investigation. His testimony, behind closed doors, was secured last month after the Justice Department, the committee and McGahn reached a tentative agreement on his appearance. Former President Donald Trump was not a party to the agreement. Trump, through his former deputy White House counsel Patrick Philbin, has made clear to the committee he doesn't intend to attempt to block McGahn from testifying, sources told ABC News. Scott Gast, another former White House lawyer, was to attend McGahn's testimony. Judiciary Chairman Jerry Nadler, D-N.Y., said in a statement following the testimony that "McGahn was clearly distressed by President Trump’s refusal to follow his legal advice, again and again, and he shed new light on several troubling events today."