The latest developments come amid new revelations about the secret Iranian peace offer the Bush administration dismissed nearly four years ago. A leaked memo shows the Swiss ambassador who transmitted the overture explicitly told U.S. officials that both supreme religious leader Ayatollah Ali Khamenei and then-President Mohammad Khatami had approved it. Iran reportedly offered full cooperation on its nuclear program, recognition of Israel and termination of support for Palestinian militant groups. The proposal was sent just weeks after the U.S. invaded Iraq. Former Deputy Secretary of State Richard Armitage recently claimed it was dismissed in part because officials couldn’t determine which proposals came from the Iranian government and which came from the Swiss ambassador.