The first question in last Saturday night’s Republican debate on foreign policy dealt with Iran, and a newly published report by the International Atomic Energy Agency. The report, which raised renewed concern about the “possible existence of undeclared nuclear facilities and material in Iran,” struck a darker tone than previous assessments. But it was carefully hedged. On the debate platform, however, any ambiguity was lost. One of the moderators said that the I.A.E.A. report had provided “additional credible evidence that Iran is pursuing a nuclear weapon” and asked what various candidates, upon winning the Presidency, would do to stop Iran. Herman Cain said he would assist those who are trying to overthrow the government. Newt Gingrich said he would coördinate with the Israeli government and maximize covert operations to block the Iranian weapons program. Mitt Romney called the state of Iran’s nuclear program Obama’s “greatest failing, from a foreign-policy standpoint” and added, “Look, one thing you can know … and that is if we reëlect Barack Obama Iran will have a nuclear weapon.” The Iranian bomb was a sure thing Saturday night.