TOPSHOT - (FILES) In this file photo taken on June 24, 2018, a child climbs up the Mexican side of the US-Mexico border fenc in Sunland Park, New Mexico. - America's border security head warned on December 26, 2018 officials were overwhelmed by the "enormous flow" of families crossing from Mexico, appealing for federal health care funding after the second child in a month died in custody. (Photo by JOE RAEDLE / GETTY IMAGES NORTH AMERICA / AFP)