The ultimate decision over peace or war must remain in the hands of the president. Why negotiate with a country of such demonstrated hostility and evasiveness? Precisely because the situation is so fraught. Diplomacy may reach an acceptable agreed outcome. Or its failure will mobilize the American people and the world. It will clarify either the causes of an escalating crisis, up to the level of military pressure, or ultimate acquiescence in an Iranian nuclear program. Either outcome will require a willingness to see it through to its ultimate implications. We cannot afford another strategic disaster.