03/27/1962
https://www.presidency.ucsb.edu...
"Underground nuclear testing, which is permitted under the treaty, will be vigorously and diligently carried forward, and the equipment, facilities, personnel and funds necessary for that purpose will ..."
"It is not only safe but necessary, in the interest of this country and the interest of mankind, that this treaty should now be approved, and the hope for peace which it offers firmly sustained, by the..."
"The United States retains the right to resume atmospheric testing forthwith if the Soviet Union should conduct tests in violation of the treaty."
"Now, Therefore, I, John F. Kennedy, President of the United States, under and by virtue of, the authority vested in me by the Constitution and laws of the United States, including; Chapter 15 of Title..."