President Barack Obama says Libyan leader Colonel Gaddafi must obey the UN's demands or face military action. Mr Obama said Thursday's UN resolution, which called for an immediate cease-fire, was not negotiable. Anchor Lisa Mullins speaks with Anne-Marie Slaughter, a former adviser to Secretary of State Clinton, and Barry Posen, who directs the Security Studies Program at MIT, about how international military force could be used in Libya.
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