U.S. Border Patrol agents, left, speak with two Central American migrants as they sit atop the border structure separating Mexico and the United States, Wednesday, Nov. 14, 2018, in Tijuana, Mexico. Migrants in a caravan of Central Americans scrambled to reach the U.S. border, catching rides on buses and trucks for hundreds of miles in the last leg of their journey Wednesday as the first sizable groups began arriving in the border city of Tijuana. (AP Photo/Gregory Bull), APTOPIX