NPR's Ari Shapiro interviews Constanze Stelzenmüller of the Brookings Institution about the agreement, which enables passport-free movement between member states. Some countries recently reimposed border controls to stem the flow of migrants.
Copyright 2021 NPR. To see more, visit https://www.npr.org. 9(MDAxODc1ODA5MDEyMjg1MDYxNTFiZTgwZg004))