The head of the International Atomic Energy Agency on Sunday warned that military strikes alone cannot eliminate Iran’s nuclear program, saying only extreme and unthinkable destruction would fully dismantle Tehran’s capabilities.

The United Nations' top nuclear watchdog, IAEA Director-General Rafael Grossi, told CBS News that Iran still has the technical ability to restart its nuclear program, even though U.S. military strikes dented the program.

Just days before the U.S. strikes on Iran, Tehran was hinting a nuclear deal with Washington was a possibility.

NPR's Scott Simon speaks to Ariane Tabatabai, the Public Service Fellow at Lawfare, about the nature of Iran's nuclear program, and whether it, as President Trump has said, posed an "imminent threat."

The International Atomic Energy Agency (IAEA) Director General, Rafael Mariano Grossi, said that he does not believe that Iran’s nuclear program can be eliminated solely by military action. “I would agree with that.

NPR's Leila Fadel asks Iran expert Ali Vaez of the International Crisis Group about Iran's nuclear capabilities before and after U.S. and Israeli attacks.