In part because it involves a lot of technical issues, in part because the world was still grappling with a whole host of other issues like the economy and the global recession, there was some skepticism that we would be able to sustain an effort around this topic.

WHITEHOUSE: President Obama Speaks at the Nuclear Security Summit

And we anticipate that the meetings with Cameron and Sarkozy will focus in part on the global economy and eurozone, and also on the Middle East and Arab Spring related issues.

WHITEHOUSE: Aboard Air Force One, En Route New York, New York