Eliot Cohen is a leading national-security scholar and an adviser to presidents, would-be presidents, and others. His latest book is The Big Stick: The Limits of Soft Power & the Necessity of Military Force. Jay asks him to take a tour around the world, and he does: beginning with Mexico, moving to Europe, moving to the Far East, and the Mideast, and elsewhere. They wind up talking about the Trump administration, which includes, in senior positions, longtime friends and comrades of Cohen’s. Spend some time with Professor Cohen, and you will have a heightened view of the world: its dangers and its promises.