Eight Democrats in Congress asked Obama to halt construction of border fence . Border Patrol agents say fence has drastically cut number of border crossings . Then - Sen . From a Vietnam War-vintage Huey helicopter , pilot Chad Smith points across the border to Mexico 's Highway 2 and then to the barriers that help stop illegal immigrants from making a sprint into southern Arizona . Obama voted to authorize almost $ 3 billion for building 670 miles of fence . Critic ##ize fence has forced illegal immigrants to make riskier desert crossings .
Eight Democrats in Congress asked Obama to halt construction of border fence . Border Patrol agents say fence has drastically cut number of border crossings . Then - Sen . Obama voted to authorize almost $ 3 billion for building 670 miles of fence . Critic ##ize fence has forced illegal immigrants to make riskier desert crossings .