People think Iran's nuclear weapons program is a threat to Israel but is it Saudi Arabia particarly Mecca that is most threatened?

Iran never officially admitted having a nuclear weapons programme. They always said they were developing nuclear power for peaceful use. If they do have such a programme, it will be for the same reason anyone else has nuclear weapons, to make themselves look big and important. Also, if they are developing them, then it will be back on, if that imbecile Trump tears up the deal Obama worked out.