Pulitzer Prize-winning investigative journalist Ronan Farrow discusses his book War on Peace: The End of Diplomacy and the Decline of American Influence. Drawing on newly unearthed document, and rare interviews with warlords, whistle-blowers, and policymakers―including every living secretary of state from Henry Kissinger to Hillary Clinton to Rex Tillerson―the book makes a powerful case for the importance of diplomats. This segment is guest hosted by DW Gibson.