Warning Foreshadowing News Today

Suffered a bad concussion. now, lawmakers say they have learned secretary clinton will testify in january. and catherine is on the story live on capitol hill today. what more are we learning of warnings that came before the attack? >>reporter: at the senate hearing, her deputies were pushed on state department classified cables that warn the threat was spiking. >> you were aware of the security risk. we have read the cables. you were fully aware. either you sent people there with security or you...