U.S. Marines at the U.S. Mexico border in preparation for the arrival of a caravan of migrants to Tijuana,...
Military helicopters fly overhead as U.S. Marines deploy concertina wire at the U.S. Mexico border in preparation for the arrival of a caravan of migrants at the San Ysidro border crossing in San Diego, California, U.S. November 15, 2018. REUTERS/Mike Blake
