Iran may have no weapons, but Russia has. It is also just about possible to learn how to make nuclear weapons on the net. It also requires an intimate knowledge of the particular discipline, which dictates that the development of Nuclear weapons requires particularly sophisticated technical equipment and procedures if development can even get beyond the first stage. Of course they could buy weapons from the Russians at any time.
The Short fuse is in the White House Bunker. Pangenocidal Pyromania
One interesting Hypothetical question.
If the top 5000 elite businessmen,bankers,politicians and power brokers were trapped in a Bunker, who'd be in charge?