WASHINGTON—A retired federal judge tapped to review the criminal case against onetime national security adviser Michael Flynn found evidence of misconduct by both the government and Mr. Flynn and urged that the retired three-star general be sentenced for the crime he pleaded guilty to back in 2017.
John Gleeson, a veteran prosecutor and former federal judge, found “clear evidence of a gross abuse of prosecutorial power” by the Justice Department in a blunt 82-page legal filing filed Wednesday criticizing the department for…