details come out i'm increasingly disappointed because there were a number of serious lapses with this guy. 20-20 retrospect is always perfect -- >> neil: hundreds of thousands of tips. >> they have done an extraordinary job since 9/11. all of that said there were enough red flags with this particular guy that there should have been a more proper and intense focus on him. remember, 2009, he is arrested on a domestic battery charge. we could have deported him then. we did not. different agency. >> did delay his citizenship. >> remember the timeline, neil. 2011, the russian government, the russian government of all people, right? asks the u.s. government, the fbi to take a closer look at this guy because they suspect he has very intense islamic radical ties. fbi opens a file on him. goes and talks to him, interviews him, closes the file, says there's no evidence. >> neil: what can they do?