at work in washington, at least they'll be there. but in more seriousness, like reporters, i think lawmakers only act when they feel they have a deadline looming. >> like reporters. thanks so much. david, lynn and tamara, thank you all for your time this afternoon. >> thank you. investigators are still trying to piece together a possible motive for washington navy yard gunman aaron alexis. 12 people were killed and eight others injured in the shooting monday morning. nbc news national investigative correspondent michael isikoff has been following this investigation very closely and joins us live from washington. michael, good afternoon. >> reporter: good afternoon. >> where do authorities stand right now on identifying a possible motive in this shooting? >> reporter: no real breakthrough what is emerging more and more is this portrait of somebody who is literally unraveling in the weeks before the rampage. we're learning more and more about that starting in the month in august when he's working for