nuclear security summit

All countries can – and must – do more to secure nuclear materials. And countries must take action today, not the day after terrorists explode a nuclear device in a major city.

What's different about the world in the wake of last week's Nuclear Security Summit, Rachel Maddow asked Joe Cirincione.

"Later today, the Washington Nuclear Security Summit will conclude by issuing a communique pledging to concentrate the international mind around President Obama’s goal of securing all separated plutonium and highly enriched uranium within four years, in order to prevent nuclear terrori