Israeli Prime Minister Benjamin Netanyahu didn’t spell out an effective way to block Iran’s path to the bomb in his address to Congress. If Netanyahu were more candid, he would acknowledge the only way to achieve his aims is through military strikes rather than negotiations. In this event, Iran would have far more reason to build nuclear weapons. If members of Congress who favor an agreement were candid, they would acknowledge it will weaken global norms for non-proliferation. If, however, Congress kills a deal that effectively constrains Iran’s nuclear capabilities, the consequences for proliferation will be far worse.