Been there done that, GWB won't respond to the threat either.
It's Israel's problem, they have to deal with it, the US needs to be prepared for the reprecussions, which will include retaliation.
Would premption be appropriate, the next President will decide that.
I believe GWB has Iran in his sights and Iranians know he will act if the threat is real. However, Osama will want to talk if the threat to Israel is real. He has said words to the effect that Israel isn’t worth us getting involved. BTW, an attack on Israel will also be an attack on us. We cannot be left untouched if Israel is attacked because we have the capability to stike back with great effec - at least with this President.