A group of about 30 Brazilian migrants, who had just crossed the border, sit on the ground near US Border Patrol agents, on the property of Jeff Allen, who used to run a brick factory near Mt. Christo Rey on the US-Mexico border in Sunland Park, New Mexico on March 20, 2019. - The militia members say they will patrol the US-Mexico border near Mt. Christo Rey, "Until the wall is built." In recent months, thousands of Central Americans have arrived in Mexico in several caravans in the hope of finding a better life in the United States. US President Donald Trump has branded such migrants a threat to national security, demanding billions of dollars from Congress to build a wall on the southern US border. (Photo by Paul Ratje / AFP)