notable
The power of executive clemency derives from Article II, Section 2, which permits the president “to grant Reprieves and Pardons for Offenses against the United States”; an 1866 Supreme Court decision affirmed that it “cannot be fettered by any legislative restrictions.”
It would take a Constitutional amendment for legislative branch to change a pardon. Good thing is, these traitor's were STILL committing treason AFTER Hussein left office.