Yesterday, President-Elect Donald Trump unofficially announced that he would nominate retired Marine Corps General James Mattis as his Secretary of Defense. What does this nomination say about the direction of the Trump administration's security and defense policy? What are the implications for the fight against the Islamic State, or for managing security challenges in Europe, Asia, and elsewhere? Dr. John R. Deni invited two SSI colleagues who are experts in U.S. defense policy and security strategy, Dr. Steven Metz and Prof. Nate Freier, to discuss these questions. Released 2 December 2016.