John Kerry: “The sanctions that have been imposed, the toughest regime ever in the history of our country and in the world, quite…”

“The sanctions that have been imposed, the toughest regime ever in the history of our country and in the world, quite frankly, has meant that it is not only--those sanctions not only act as a deterrence, but probably more importantly in the short run, they act as a way to slow Iran's progress”