FILE - Migrants wait to be processed by the U.S. Customs and Border Patrol after they crossed the Rio Grande and entered the U.S. from Mexico, Oct. 19, 2023, in Eagle Pass, Texas. A recent decline in arrests for illegal crossings on the U.S. border with Mexico may prove only temporary. The drop in January reflects how numbers ebb and flow, and the reason usually goes beyond any single factor. (AP Photo/Eric Gay, FILE)