Iran has enough missiles to overwhelm any missile defense system and that is also true of the US naval forces in the Persian Gulf. Search millennium 2002 project. A summary is on wikipedia as well, It was a simulation of how Iranians will fight. They don't need nukes.
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Livni: Shaked's annexation bill would lead to bi-national state with Palestinian majority in Knesset
from the article: Another reason Israel can postpone attack on Iran