The size and shape of U.S. nuclear forces must be determined in the context of the highest considerations of United States strategy. And one of the highest strategic considerations for the United States in the coming decades is to prevent the use of nuclear warheads against any city in the U.S. or indeed anywhere in the world, whether by the act of a state or of a terrorist group. Contrary to assumptions made in the current U.S. administration's nuclear policy, research into new types of nuclear weapons could damage our nonproliferation objectives.

Remarks at the June 21-22, 2004 Carnegie Conference on Non-Proliferation in Washington, D.C.