more breaking news out of libya tonight. rumor moammar gadhafi may be ready to hand over power to his son. in just a moment we'll talk to nic robertson who's been following this angle and has new information tonight. but first a new look at fighting on the ground. opposition fighters, gadhafi forces continue to fight for control of brega. an opposition officer says gadhafi's troops are on the defensive there, surrounded from three directions. with nato air strikes dwindling, one opposition spokesman says the u.n. resolution is not being implemented. he says fighters are wondering where are they? meanwhile, the gadhafi regime is floating a scenario for gadhafi's son, saif, to take over without it looking like his father's being forced out. joining us live from ajdabiya is ben wedeman with opposition forces. in tripoli nic robertson. and at the state department jill