President Dwight D. Eisenhower’s health problems and President John F. Kennedy’s assassination heightened support for a constitutional amendment to address the exercise of presidential power in the event of presidential disability and to provide a process for filling a vacancy in the vice presidency. S.J. Res 1 was introduced on January 6, 1965 by Senator Birch Bayh (D-IN), chair of the Subcommittee on Constitutional Amendments of the Senate Judiciary Committee. It was similar to a resolution that had passed the Senate on September 29, 1964. Bayh introduced the resolution while he continued to gather co-sponsors, who are indicated by a check mark by their names on the attached Senate roster. The 1,530 copies of the resolution ordered printed included the names of those cosponsors.