simply underlines the importance of congress getting to the bottom of this. >> gregg: katherine herrage obtained a classified cable from the u.s. mission in benghazi less than a month before the attack. it told washington consulate cannot be defended and islamist militants and al-qaeda are everywhere. is this, in your mind, pretty clear and convincing evidence that the obama administration was warned that an attack could happen, yet did nothing? >> absolutely. i've had a chance to read that cable. i tell you, it is the smoking gun in this investigation, at least so far. the idea, for example, that the c.i.a. station in benghazi offered to bring the consulate personnel into their compound a month before the september 11 attack shows just how worried everybody in benghazi was about precisely what happened just a few weeks later. so i mean, this is a devastating