Op-ed by U.S. President Barack Obama in the Washington Post, 30 March 2016:
Of all the threats to global security and peace, the most dangerous is the proliferation and potential use of nuclear weapons. That’s why, seven years ago in Prague, I committed the United States to stopping the spread of nuclear weapons and to seeking a world without them. This vision builds on the policies of presidents before me, Democrat and Republican, including Ronald Reagan, who said “we seek the total elimination one day of nuclear weapons from the face of the Earth.”
More broadly, the security of the world demands that nations — including the United States — ratify the Comprehensive Test Ban Treaty and conclude a new treaty to end the production of fissile material for nuclear weapons once and for all.