What will America do when Iran has nuclear weapons?

Hillary Clinton promises she'd "obliterate" Iran if it used nuclear weapons against Israel, suggesting that, as president, she'd return the "favor" -- in spades.

Putting aside campaign rhetoric, the senator raises an excellent point: What will America do when Iran gets nuclear weapons? Many national security experts still think Washington can stop Tehran's reach for the bomb. I am not one of them. Iran has already achieved a sloppy, asymmetrical form of nuclear deterrence, meaning we can't stop it from "getting nuclear" unless we "go nuclear" pre-emptively, something we won't do.

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