(FILES)A US Border Patrol agent stands near a crossing to Mexico at the San Ysidro port of entry along the US-Mexico border near San Diego, California in this April 4, 2013 file photo. Twenty thousand new border patrol agents, hundreds of miles of fencing, billions of dollars in drones, radar and sensors: US lawmakers are proposing a militaristic remedy to staunch illegal immigrant flow from Mexico. The Senate is expected June 24, 2013 to green-light the most important amendment yet to the landmark immigration bill, but the measure — designed to placate Republican concerns about security — would ensure that the border region is one of the most highly policed zones in the Western Hemisphere. AFP PHOTO/Frederic J. BROWNFREDERIC J. BROWN/AFP/Getty Images
