In a joint statement, Representative John Conyers Jr. of Michigan, the ranking Democrat on the House Judiciary Committee, and Representative Elijah E. Cummings of Maryland, the ranking Democrat on the House Committee on Oversight and Government Reform, said, “We in Congress need to know who authorized his actions, permitted them and continued to let him have access to our most sensitive national security information despite knowing these risks. We need to know who else within the White House is a current and ongoing risk to our national security.”