Eight Democrats in Congress wrote Obama to halt building of border fence . Border Patrol agents say fence has drastically cut number of border crossings . Standing alongside the steel barrier at a point in which there is just one layer of fencing , Lowrie shakes his head when told that some in Washington want to stop additional construction in other areas . The Associated Press contributed to this report. Obama voted to authorize almost $ 3 billion for building 670 miles of fence . Critic says barrier has forced illegal immigrants to make riskier desert crossings .
Eight Democrats in Congress wrote Obama to halt building of border fence . Border Patrol agents say fence has drastically cut number of border crossings . The Associated Press contributed to this report. Obama voted to authorize almost $ 3 billion for building 670 miles of fence . Critic says barrier has forced illegal immigrants to make riskier desert crossings .