Jacquelyn Kasulis, who most recently served as chief assistant U.S. attorney to acting U.S. Attorney Mark Lesko of the Eastern District of New York, will lead the office in an acting capacity as Lesko moves to a new role in the Department of Justice, a source familiar with the matter confirmed Monday.

Lesko’s move was first revealed by the Associated Press, which reported Monday morning that assistant attorney general for national security John Demers will resign in the coming weeks amid reports that the DOJ secretly obtained records from elected Democrats during the Trump administration.