President Barack Obama delivers his speech to the Nunn-Lugar Cooperative Threat Reduction (CTR) symposium at the National Defense University in Washington, Monday, Dec. 3, 2012. Seated are, from left Defense Secretary Leon Panetta, Sens. Sam Nunn and Richard Lugar. (AP Photo/Manuel Balce Ceneta)

Associated Press
President Barack Obama delivers his speech to the Nunn-Lugar Cooperative Threat Reduction (CTR) symposium at the National Defense University in Washington, Monday, Dec. 3, 2012. Seated are, from left Defense Secretary Leon Panetta, Sens. Sam Nunn and Richard Lugar. (AP Photo/Manuel Balce Ceneta)
President Barack Obama delivers his speech to the Nunn-Lugar Cooperative Threat Reduction (CTR) symposium at the National Defense University in Washington, Monday, Dec. 3, 2012. Seated are, from left Defense Secretary Leon Panetta, Sens. Sam Nunn and Richard Lugar. (AP Photo/Manuel Balce Ceneta)
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