U.S. Secretary of State Mike Pompeo (R) and visiting Mexican Secretary of Foreign Affairs Luis Videgaray Caso attend a photo opportunity before their meeting at U.S. Department of State in Washington D.C., the United States, on Aug. 17, 2018. (Xinhua/Shen Ting)

U.S. Secretary of State Mike Pompeo (R) and visiting Mexican Secretary of Foreign Affairs Luis Videgaray Caso attend a photo opportunity before their meeting at U.S. Department of State in Washington D.C., the United States, on Aug. 17, 2018. (Xinhua/Shen Ting)

U.S. Secretary of State Mike Pompeo (R) and visiting Mexican Secretary of Foreign Affairs Luis Videgaray Caso attend a photo opportunity before their meeting at U.S. Department of State in Washington D.C., the United States, on Aug. 17, 2018. (Xinhua/Shen Ting)