LTG (Ret.) H.R. McMaster is a soldier, scholar and strategist. A graduate of West Point, he served in the U.S. Army for 34 years, earning a doctorate in history along the way, and retiring as a Lieutenant General. From February 2017 until April 2018, he was President Trump's National Security Advisor. He's currently the Fouad and Michelle Ajami Senior Fellow at the Hoover Institution at Stanford University, and he's also the chairman of the advisory board of FDD's Center on Military and Political Power.

He's just published a new book, Battlegrounds: The Fight to Defend the Free World. He joins Cliff to discuss his time as the U.S. National Security Advisor, his assessment of the latest international security issues ranging from China and Russia to Afghanistan, and his book — including what he hopes the next U.S. administration can gain from it.