TOPSHOT - Migrants from poor Central American countries -mostly Hondurans- moving towards the United States in hopes of a better life, are seen near the U.S. border in Playas de Tijuana, Mexico, on November 13, 2018. - US Defence Secretary Jim Mattis said Tuesday he will visit the US-Mexico border, where thousands of active-duty soldiers have been deployed to help border police prepare for the arrival of a "caravan" of migrants. (Photo by Guillermo Arias / AFP)