A worker installs concertina wire on the U.S. side of the border, seen through the bars of the border structure in Tijuana, Mexico, Wednesday, Nov. 14, 2018. 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