[R]egardless of any private understandings the two leaders reach on Monday, Washington should continue to emphasize one idea in public: while the United States and Israel share the same objective regarding Iran and the same preference for a diplomatic solution, Israel ultimately makes its own decisions about its own security. Such an approach would further ratchet up pressure on Tehran, turning the all-too-visible differences in U.S. and Israeli policy over military action into a factor that advances common U.S. and Israeli policy objectives. As Vice President Biden's national security advisor Antony Blinken put it in a speech this week, "Israel has to make its own decisions. We are not in the business of telling our allies and partners what to do when it comes to their own national security."
http://www.washingtoninstitute.org/templateC06.php?CID=1834