Even as it lies about its closeness to acquiring nuclear missiles, it continues to menace the political order throughout the Middle East, pressing on with rocketry and rearming Hamas and Hezbollah. And that mischief is nothing to what it will do if it is allowed to become a nuclear power.

Nuclear Iran will be a threat to US national security, worldwide energy security, the efficacy of multilateralism and the Non-Proliferation (NPT) Treaty. Having defied the world...