Iran's nuclear negotiator threatens to boot inspectors if sanctions return

Iran will end its participation in international weapons inspections if United Nations sanctions are reimposed, said the man now in charge of Iran's nuclear negotiations. Ali Larijani, secretary of the Supreme National Security Council, was responding to what are called snapback' mechanisms scheduled to take effect this weekend. Carolyn Beeler speaks with FRONTLINE reporter Sebastian Walker about his exclusive interview with Larijani.