A US Border Patrol truck is parked under train tracks on the property of Jeff Allen, co-owner of a property on the US-Mexico border and member of a local militia, 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)