I would be really careful when labeling it in that way.
If Iran nuked Israel, the US would join in even more and retaliate for Israel, since most of our gov't and politicians get some form of donations or help from AIPAC and such.
This would start WWIII at a much quicker rate than what it currently is, not to mention Russia and China would also have to join in.
Zionists would be a better word, IMO, force a ceasefire and sanction Israel would be the minimum.