Guests: An interview with H.R. McMaster, retired lieutenant general, former White House National Security Advisor under President Trump, and author of "At War with Ourselves: My Tour of Duty in the Trump White House." This week's panel discussion includes Rich Lowry, editor-in-chief of National Review and author of "The Case for Nationalism: How It Made Us Powerful, United, and Free;" and John Avlon, author and former CNN anchor who is now running for Congress in New York's first district.