We will not go into war with Iran, we simply will impose crippling sanctions the way sanctions should've been had it not been for Obama's weakness and delusion.
If Iran will decide to go into war with us, then it will be on Iran to answer for it.
Iran going into war with the US? I don't think they're stupid; Actually, the Iranians are known for their clever pragmatism. They cope when feeling the heat.
No need for additional sanctions if Iran is complying with the Nuclear deal. Or, it would be a unilateral ineffective sanction from the U.S. part only; at a time where EU, Russia and China enjoy business contracts in Iran.
Sanctioned have worked and Iran is complying with the Nuclear deal. Now, if the purpose is to curb Iran's influence in the region; that's another issue. It should be tackled in different ways. Maybe, part of it, it is to bring Iran closer not further from US.
War is out of question for both sides.