welcome back to our special coverage of benghazi hearing. you see hillary clinton arriving at the longworth office building. she'll be testifying for hours today about what happened on september 11, 2012 when four americans were killed at the u.s. diplomatic compound in benghazi, libya. the testimony could go all the way until late this afternoon, maybe even early evening. dana bash is up on capitol hill right now. that room is quickly filling up, the longworth house hearing room. i take it the secretary's now meeting behind closed door with the chairman, trey gowdy? >> reporter: that's right. we are in the hallway. i'm standing next to our camera. you probably only see a lot of police officers and security but there's a whole line of cameras waiting for her to walk out of a