Amendment 25 - Information and resources including when the amendment has been invoked. Shown is a graphic of resignation of Richard Nixon and a history of the line of succession.
Miller Center Commission on Presidential Disability - The Commission examined the 25th Amendment in order to identify potential difficulties in presidential succession that might arise in extremely complicated scenarios. Includes link to PDF of the report.
Presidential Succession - Order of succession if the President of the United States if the sitting president quits, dies, becomes disabled or is impeached.