Intelligence is not a science.

Putin has a lot at stake here and restoring the relationship with the United States, and there are already signs as Sandy mentioned that he's moving in the right direction to begin to ascertain that their trade with Iran is not used for the production of nuclear weapons.

Of course, China is a key to the North Korea if we're going to solve that riddle, but they could also be helpful on Iraq, which is why it's important that we maintain a constructive dialogue with China.

There's clearly something to be said for success and following through on your commitments.

These are all elements, but the main thing we can do in the Middle East is encourage the reformist elements.

Over a period of time, I think the popular will in Iran will prevail.

And I argued with that intelligence estimate and I think it is a responsibility of policymakers to use their best judgment on the basis of the intelligence they've received.