<P> The Presidential Succession Act establishes who shall exercise the powers and duties of the office of President of the United States in the event that neither a President nor Vice President is able to "discharge the powers and duties of the office ." The current Act was adopted in 1947 and is codified at 3 U.S.C. § 19 . </P> <P> Constitutional authority for Congress to enact such a law is twofold: Article II, Section 1, Clause 6 and Section 3 of the Twentieth Amendment . </P>

Who takes over for the president if he cannot fulfill his duty