The threat from North Korea: a diplomat's perspective on what's changed and what hasn't, then, shifting notions on tax payer money for religious institutions and the separation between church and state.
President Obama hosts an unprecedented two-day Nuclear Security Summit in Washington.
- Joseph Cirincione President, Ploughshares Fund
- Stephen Rademaker Senior Counsel with the BGR Group. Former Assistant Secretary of State from 2002 to 2006, where he directed nonproliferation policy toward Iran and North Korea.
- David Sanger chief Washington correspondent for "The New York Times," author of "The Inheritance: The World Obama Confronts and the Challenges to American Power."
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