In April 1961, Morse was outraged by the Bay of Pigs invasion, and in a letter to the Secretary of State, Dean Rusk, accused the Kennedy administration of acting unconstitutionally as he expressed his "deep regret" that Congress was not informed by the administration "prior to making its decision to intervene in the Cuban invasion through granting logistic and other support to the Cuban exiles." In May 1961, Morse announced that the Senate Latin Affairs Committee would investigate reports that the United States was holding survivors of the Bay of Pigs Invasion incommunicado on U.S. submarine base in Vieques, Puerto Rico. Morse said the investigation had primarily been handled by White House staff instead of State Department officials.