CNN's Candy Crowley asks Senate Armed Services Committee Chair Carl Levin if the fly-over mission in Libya will work.
Nuclear analyst Joe Cirincione discusses the worst-case scenario for the nuclear crisis in Japan.
Economists discuss the impact that the crisis in Japan and the Middle East unrest are having on the global economy.
Sen. Joe Lieberman on the government crackdown on protesters in Syria and getting tough on Assad's regime.
Energy Secretary Steven Chu on preventing a nuclear meltdown and whether U.S. plants can withstand natural disasters.
U.S. Joint Chiefs of Staff Chairman Adm. Mike Mullen tells Candy Crowley a no-fly zone is "effectively in place."