Israel cant go to war with Iran without the US military doing all the work
If either one starts a shooting war the best thing the US can do is stay the hell out of the way and let the two duke.
We best stay the fuck out of it. Fighting Iran is a logistical nightmare even with Iraq on the west and Afghanistan on the east.
Wont be like steamrolling Saddam they will fight and I believe fight hard if their nation gets invaded. They would be ackbaring shit all around the world just for spite along with their actual military fighting for Iranian dirt. 
Id be really happy if my government would stay the fuck away from that mess but who knows. Sooner or later Israel zion fuckers will try and get the whole world to come fight them so they can spawn their savior into existence, basically by forcing prophecy into reality. Who knows where we're going to end up or whats going to happen tho. You never know who you boss is going to be and how they are going to act from one term to the next anyway. Hard to predict the future when leadership changes every 4 years but maybe thats the point.