H. R. McMaster is both a soldier and a scholar and has served at the highest level in government as National Security Advisor to President Trump. He served in the US Army for more than 30 years achieving the rank of lieutenant general, he saw combat during the first Gulf War and later was a counterinsurgency advisor to General David Petraeus. He has a PhD from the University of North Carolina and examining the failures of leadership during the Vietnam War and he is now a Senior Fellow at the Hoover Institution. He joins Dan on today's podcast to bring his experience and knowledge from decades of public service to bear on some of the most challenging questions of our age. He and Dan discuss the failures of the Vietnam and Afghan wars, how to fight a successful insurgency campaign, the meaning of leadership and what it was like to work for Donald Trump.