Iranian President Mahmoud Ahmadinejad (L) and former president Akbar Hashemi Rafsanjani attend the opening session of Iran's new parliament in Tehran on May 27, 2012. Tehran has "no reason" to suspend its enrichment of uranium to 20 percent -- one of the key demands of world powers engaging Iran in talks -- the head of its Atomic Energy Organisation said. AFP PHOTO/ATTA KENARE        (Photo credit should read ATTA KENARE/AFP/GettyImages)