Rep. Mike Turner, Sen. Tammy Duckworth, Ambassador Oksana Markarova

This week on Face the Nation, President Trump begins the next phase of his agenda with a key staff shakeup. Mike Waltz is out as National Security Adviser, and Secretary Marco Rubio is in, adding another job to his growing list of responsibilities. With Trump's push for a nuclear deal with Iran and an end to Russia's war in Ukraine, we'll ask Republican Mike Turner about the impact of the shuffle. We'll also get insights from one of Trump's national security advisers in his first term, retired Lieutenant General H.R. McMaster. Plus, Illinois Democratic Senator Tammy Duckworth will...