TOPSHOT - Carla Lisette, from El Salvador, part of the Central American migrants moving towards the United States in hopes of a better life, watches her phone at a tent near the US-Mexico border in Playas de Tijuana, Baja California state, Mexico, on November 21, 2018. - US troops stationed on the border with Mexico ahead of the expected arrival of a Central American migrant caravans can intervene to quell violence but will be armed only with batons, Defense Minister Jim Mattis said (Photo by Guillermo Arias / AFP)