He served as Louisiana’s first solicitor general and general counsel for Becket Law when the firm represented Hobby Lobby in its challenge to Obamacare’s contraceptive mandate. Duncan has argued cases in more than 30 federal and state appellate courts, including the U.S. Supreme Court. Duncan, who also was a professor at the University of Mississippi School of Law, is the president’s pick for a Louisiana seat on the 5th Circuit. Louisiana’s two senators are Republicans Bill Cassidy and John Kennedy.