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.

The chief of the UN's nuclear watchdog has warned that Iran could be capable of restarting production of enriched uranium "in a matter of months"