The Trump administration spent the weekend and Monday defending its “zero tolerance” border policy, which has separated children and parents who crossed the U.S.-Mexico border illegally. The NPR Politics team breaks down what that policy is and how it is being implemented. This episode: political reporter Asma Khalid, Congressional correspondent Scott Detrow, national political correspondent Mara Liasson, and KQED’s John Sepulvado. Email the show at nprpolitics@npr.org. Find and support your local public radio station at npr.org/stations.