Libya and Middle East unrest - live coverage
• Pro-Gaddafi forces retake Brega and advance on Ajdabiya
• Britain backs US on legality of arming Libyan rebels
• Defiant Gaddafi denounces rebels as al-Qaida terrorists
• Top US officials to brief Congress on Libya strategy
• Assad gives first speech since protests began
CBS News: Top Libyan minister defects to the U.K.