Tonight's guest list:
Joe Cirincione, member of the Council on Foreign Relations, president of the Ploughshares Fund, author of the new book “Nuclear Nightmares: Securing the World Before It Is Too Late”
David and Francine Wheeler, who lost their six-year-old son Ben at Sandy Hook Elementary School in Newtown, CT last year
Video preview coming right up -- in the meantime, stay tuned.