The Trump administration now with the help of 3.6 billion diverted from the Pentagon and other executive actions says they expect to build 450 to 500 miles of new border wall by the end of 2020. The US Border Patrol has begun construction of five miles of a 30-foot border wall along the Colorado River near Yuma, Arizona. Border Patrol spokesman Jose Garibay said that the wall is replacing an older barrier that was designed to stop vehicles from crossing but allowed people to pass.