Chief of U.S. border patrol testifies in Washington D.C.

Chief of U.S. Border Patrol Carla L. Provost (C) testifies on "Narcos: Transnational Cartels and Border Security" before the Subcommittee on Border Security and Immigration of the Senate Judiciary Committee in Washington D.C., the United States, on Dec. 12, 2018. (Xinhua/Ting Shen)???