Marty Schenker, Chief Content Officer for Bloomberg, on headlines moving markets today: U.S. mulling military strategies in Syria, Trump considering firing Rosenstein to end Mueller investigation. Billy House, congressional reporter for Bloomberg, on Paul Ryan's announcement to not seek reelecion, and who could replace him. Paul Sweeney, U.S. Director of Research and Senior Media/Internet Analyst, on the two big issues that Facebook will need to tackle. Shira Ovide, Bloomberg Gadfly technology columnist, with recap and analysis of Mark Zuckerberg's testimony before Congress.