In her first speech to the United Nations, Secretary of state Condoleezza Rice on Saturday urged diplomats to be tough on Iran’s nuclear ambitions. The United Nations “must be able to deal with great challenges like terrorism and nuclear proliferation, especially when countries like Iran threaten the effectiveness of the global nonproliferation regime,” she said. Earlier in the week, Rice, accompanied by Gen. Raymond Odierno, sat down with Newsweek editors and discussed Iran, Hurricane Katrina, the war in Iraq and a number of other topics.