Iran WILL use a nuke on Israel and when it comes to that, Israel will be forced to respond.
Iran does not have any known nukes yet. I don't care what PaceDog's security clearances allow him to see that we cannot see. Iran is officially a non-nuclear nation.
Israel wanted to join the "Big Boys" club by developing its own nukes. It did everything Iran is now only accused of doing IN SPADES. Theft of nuclear materials, espionage, even secret above ground nuclear tests (Vela Incident, October 22, 1979). Israel showed other nuclear-wannabes how they also could thumb their noses at the world without sanctions and join the club--now we have India, Pakistan, North Korea... Israel even helped South Africa develop a stash of A-bombs.
Now that Israel is in the Big Boys club, it needs to act like a Big Boy, or do what South Africa did (declare and disarm) and leave the club. The other Big Boy members don't threaten pre-emptive strikes on other nations, because they don't need to. That is the essence of 'nuclear deterrence.'
Israel lied when it claimed it would not 'be the first' to introduce nuclear weapons to the Middle East. It is their fault that Iran has even pondered acquiring them.
Bibi's blustering about Iran only proves that he hasn't matured enough as a leader to even be in control of nuclear weapons. Obama needs to ride him hard, which he is thankfully doing.