Iranian President Ahmadinejad says “we do not need a bomb.”
It’s true. You don’t need a bomb, just the threat of one. If you want to lean on some opponent, then convince them that you have one, whether you do or not.
On the other hand, if you are going to have a nuclear bomb, and plan to actually use it, then you ought to consider having another ready to launch when your adversaries retaliate. Having just one bomb might be a liability.
Maybe he is really saying “we do not need one bomb.”