President Trump vowed to withdraw United States troops from the Syrian border with Turkey. But such a move could harm one of America\u2019s most loyal partners in the Middle East, the Kurds, who have been crucial to fighting the Islamic State. Guest: Eric Schmitt, who covers terrorism and national security for The New York Times. For more information on today\u2019s episode, visit nytimes.com/thedaily.\xa0\n\nBackground coverage:\xa0President Trump\u2019s announcement raised fears that he was giving Turkey the go-ahead to move against Kurdish forces in northern Syria.The American pullback could create a void in the region that could benefit Iran, Russia and the Islamic State.American troops have \u201coperated between two allies: Turkey and the Kurds,\u201d our colleagues write in a news analysis. \u201cThe problem for Washington has been that the two hate each other.\u201d