WHILE THE POSITION of the Government of the United States with respect to the Naval Base at Guantanamo has, I believe, been made very clear, I would like to reiterate it briefly.
Our rights in Guantanamo are based on international agreements with Cuba, and include the exercise by the United States of complete jurisdiction and control over the area. These agreements with Cuba can be modified or abrogated only by agreement between the two parties, that is, the United States and Cuba. Our Government has no intention of agreeing to the modification or abrogation of these agreements and will take whatever steps may be appropriate to defend the Base.
The people of the United States, and all of the peoples of the world, can be assured that the United States' presence in Guantanamo and use of the Base pose no threat whatever to the sovereignty of Cuba, to the peace and security of its people or to the independence of any of the American countries. Because of its importance to the defense of the entire hemisphere, particularly in the light of the intimate relations which now exist between the present Government of Cuba and the Sino-Soviet bloc, it is essential that our position in Guantanamo be clearly understood.
Dwight D. Eisenhower, Statement by the President Regarding the U.S. Naval Base at Guantanamo, Cuba. Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/234373