maybe goes into a chat room on a public site, or through comments and chat, and as they start, they radicalize themselves, that is when they can start, when someone reaches out from the terror network like isis, and they say, let me invite you to a one-on-one conversation on whatsapp. that is how it moves. >> martha: they also learn how to stab someone wearing a vest, which is how they would happen to the officer in this case. ben, thank you. good to have you. finally, tonight, as the white house pledges to turn to tax reform, here is the quote of the night from cowboy writer will rogers. the only difference between death and taxes is that death doesn't get worse every time congress meets. let's hope they can turn that reputation around, folks. thanks for watching. i am martha maccallum. we will see you tomorrow at 7:00. up next, bill o'reilly, talking to chairman nunes. we will talk to you tomorrow.