shannon: is the reason for optimism? three top administration officials say the recent saber rattling is about deterrence, not provoking war with iran. impeachment, debt ceiling negotiations, trade war with china and the us and ca trade deal. let's dig in with john thune, senate majority whip. you were in the briefing today, what do you take from it? >> we had the administration team explaining why they reacted the way they did with good reason, there are credible threats, specific threat and they did a good job laying out why we are doing what we are doing and taking the action we have taken and i think we have to be prepared. this is an area of the world