A Central American migrant climbs up the border fence between Mexico and the United States for fun while moving to a new shelter in Mexicali, Mexico, Nov. 19, 2018./ VCG Photo

A migrant girl stands beside the border fence between Mexico and the United States as her father holds her hand. /VCG Photo

After leaving a shelter near the border with Calexico, California, U.S., the migrants head to Mexicali's downtown in Mexico's Baja California State. /VCG Photo

U.S. Customs and Border Protection (CBP) Special Response Team (SRT) officers stand guard at the San Ysidro Port of Entry after the land border crossing was temporarily closed to traffic from Tijuana, Mexico. /VCG Photo