Last Spring the Israelis asked Bush for permission to fly across Iraqi air space and bomb the main nuclear facility at Natanz in Iran with U.S. made bunker-busting bombs. Bush denied the Israeli request. http://cbs5.com/national/george.w.bush.2.905081.html I have the distinct feeling that the Israeli's aren't going to bow down to anyone on this issue anymore going forward.
If they are going to attack, they will have to do it before Iran gets its new russian integrated air defense system. Either that or use missiles.