[StJacques]

I have to be honest and state that I doubt this is true. I wish it was true, so please don't bust my chops for what I am posting, but here is why I am a doubter.

The U.S. is trying very hard to get Iran to agree to stay within the U.N. framework for handling nuclear proliferation. Yes, that's right, the U.S. is trying to look to the U.N. - forget what Kerry says about Bush ignoring the organization - and France, yes France!, is trying to make the U.N. system work in this instance so that the U.S. does not go off on its own and make the U.N. completely irrelevant. France has a genuine interest in protecting the value of its veto power in the U.N. Security Council and if the U.N. cannot handle the Iranian situation France, and everyone else, will have to sit by and watch the U.S. go off on its own again, even though it would be Israel doing the dirty work, to settle the matter.

For these reasons I doubt that the U.S. is giving Israel a green light for the operation. This could be an attempt to frighten the Iranians into cooperation, but that is as far as I think it goes.

[Neoc0n]

Green light or no, the State of Israel will not allow a nation still officially at war with it to aquire nuclear weapons.

The only time constraint, is it must be hit before the reactor goes live, to not cause radiation issues.

[Rebelbase]

Israel doesn't need US approval to protect itself from an atomic/nuclear threat.