matt appuzzo with "the new york times." thank you for that. john yang at the white house, lisa desjardins at the capitol, thank you all three. >> woodruff: and now we get analysis from four people with extensive experience in government and the law: george terwilliger served as deputy attorney general under president george h.w. bush. gregory craig, former white house counsel to president obama. john carlin served as assistant attorney general for national security at the department of justice from 2014 until october of last year. and carrie cordero served in the justice department under presidents george w. bush and obama, where she worked on matters of national security. let's take a closer look now at some of the revelations from today's hearing, beginning with what comey said he couldn't answer publicly. it starts with a question from committee chairman, senator burr. >> in the public domain is this question of the "steel dossier," a document that has been around out in for over a year. i'm not sure when the f.b.i. first took possession of