While the invasion forces gathered in Florida, Kennedy ordered the U.S. State Department to develop a plan for civil governance in Cuba. Former Secretary of State Dean Acheson and the Joint Chiefs of Staff favored an invasion, but U.S. Attorney General Robert F. Kennedy vehemently opposed that plan and instead advocated a blockade. The President listened to his brother, and on 22 October 1962, appeared on television to explain to America and the world that the United States was imposing a strict quarantine on offensive military equipment being shipped to Cuba. Kennedy also warned Khrushchev that the United States would regard any missile attack from Cuba as an attack from the Soviet Union and would retaliate against the Soviet Union.