Congress must stop President Obama's nuclear deal with Iran. The most important reason — Iran can threaten the existence of the United States by making an electromagnetic pulse (EMP) attack using a single nuclear weapon.

It may obtain one, relatively easily, by cheating in the use of the nuclear infrastructure permitted them under the agreement.

U.S. intelligence cannot meet the impossibly high standard of assuring that Iran cannot acquire a single nuclear weapon and, given the regime's existing nuclear infrastructure, cannot with absolute certainty guarantee that Iran does not already have one.