Inside One of the Worst Leaks in U.S. History

21-year-old guardsman Jack Teixeira allegedly shared hundreds of classified documents online. He’s currently pleading not guilty as he awaits trial. The new Frontline documentary "The Discord Leaks" explores how the gaming platform became a center not only for security breaches, but also for unmoderated extremism. Washington Post investigative reporters Samuel Oakford and Shane Harris discuss.