Arafat's whole life has been governed by struggle and a cause. Everything he has done as leader of the Palestinians is to always leave his options open, never close a door.

I am the Counselor at the Washington Institute for Near East Policy.

It has been an honor to work in the Barack Obama Administration and to serve this President, particularly during a period of unprecedented change in the broader Middle East. Obviously, there is still work to do but I promised my wife I would return to government for only two years and we both agreed it is time to act on my promise.

You don't have any communication between the Israelis and the Iranians. You have all sorts of local triggers for conflict. Having countries act on a hair trigger - where they can't afford to be second to strike - the potential for a miscalculation or a nuclear war through inadvertence is simply too high.

Security is something that serves Israeli interests and Palestinian interests. You have a common threat and you have a common enemy and it's important to deal with that as partners.

Force is not inevitable. Diplomacy is still the desired means. Pressure is an element of the means.

I wouldn't discount the possibility that the Israelis would act if they came to the conclusion that basically the world was prepared to live with Iran with nuclear weapons. They certainly have the capability by themselves to set back the Iranian nuclear program.