Israel isn't a formal ally though. We have no treaties with them at all.

It's an interesting grey area. Treaties would require voting. But them buying our politicians never gets voted on.

Anyway, a few missile attacks aren't going to do shit. Iran is pretty far from Israel so how are they ever going to actually "attack" them? In fact this attack is likely to be so ineffectual it's probably a false flag to get us to invade Iran.