now more businesses in more places can afford to dream gig. it's hard to get all the daily that's why i love fiber choice. it has the fiber found in many fruits and vegetables, all in a tasty, chewable tablet. fiber choice... the smart choice. the world is watching as the middle east reacts to president trump's decision to pull out of the iran nuclear deal with protests, escalating rhetoric and violence. here with more, our guest, the author of "isis, a history." good to see you. first, how much did trump's exit from the iran deal in your view influence the tensions that we're seeing right now unfold in the middle east? >> there is no doubt in my mind that there is a causal relationship between the current escalate between israel and iran