The head of the UN’s nuclear watchdog says US strikes on Iran fell short of causing total damage to its nuclear program and that Tehran could restart enriching uranium “in a matter of months,” contradicting President Donald Trump’s claims the US set Tehran’s ambitions back by decades.

Rafael Mariano Grossi, director general of the International Atomic Energy Agency, told CBS that Iran had a "a very vast ambitious" nuclear program.

Rafael Grossi, the head of the U.N.’s nuclear watchdog, disputed President Donald Trump’s assessment that Iran’s missile sites were “totally obliterated” by U.S. airstrikes earlier this month.