Even if Iran gets Nuclear weapons, it will not attack anyone/Israel. To do so would bring it's immediate destruction. It is more likely that Israel will attack other countries and Iran getting nuclear weapons and then signing a mutual defense pact with Syria and Lebanon would neuter Israels ability to attack anyone without consequence. The whole drum beat is to keep Israel dominant in a region where it is stealing and keeping land in contravention to International Law and Geneva conventions it has signed.
Gunmen in Egypt kill guard outside Niger embassy (Reuters)
from the article: Clinton: We won't get a serious response from Iran without sanctions