Who ??? Our good "allies" Pakistan supplied them with the nuclear technology.
It is my belief that Iran has had a nuclear capability for quite some time from blackmarket warheads and arty shells from the collapse of the USSR and a European power. What the Iranians lacked was the PAL code to unlock the detonators on those nukes. I have always suspected that the Iranian effort was to develope new triggers for those old nukes. We'll see in the months ahead what is and isn't, likely just before the US national elections.