Iran's nuclear program could be operating again 'in months'

Iran's nuclear program could be up and running again in a matter of months, says the head of the United Nations nuclear watchdog.

"The capacities they have are there. They can have, in a matter of months, I would say, a few cascades of centrifuges spinning and producing enriched uranium, or less than that," Rafael Grossi, director-general of the International Atomic Energy Agency, told CBS' Face the Nation with Margaret Brennan aired on Sunday.

"Frankly speaking, one cannot claim that everything has disappeared and there is nothing there."