LULU GARCIA-NAVARRO, HOST:
So President Trump continues to defend his decision to begin pulling U.S. troops out of northern Syria. But that move has put 1,000 troops that remain in the area in danger. Defense Secretary Mark Esper told CBS' Face the Nation this morning that U.S. forces are finding themselves caught in the crossfire between Turkey and the Kurds, a situation he called, quote, "very untenable." NPR's Pentagon correspondent Tom Bowman is here to tell us more. Good morning, Tom.
TOM BOWMAN, BYLINE: Hey, Lulu.