Two of the most notorious Islamic State militants were charged in a Virginia federal courtroom Wednesday with crimes stemming from the kidnapping and killing of four Americans in Syria. It's the next step in the pursuit of justice for a case that began with unspeakable horrors. Nick Schifrin reports and talks to John Demers, assistant attorney general for national security, about its significance. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders