President Obama will deliver a speech to the nation tonight about Libya. He’s expected to address some of the many questions Americans have about U.S. involvement in the North African nation. Yesterday NATO agreed to take over command of the allied military campaign in Libya. Secretary of State Hillary Clinton said actions by the U.S. and NATO to implement a no-fly zone had averted a humanitarian disaster. But some U.S. lawmakers of both major parties remain skeptical. We’ll talk about what, in effect, it means for NATO to take control and what the U.S. role is likely to be in the months to come.