Barriers Along the U.S. Borders: Key Authorities and Requirements. Congressional Research Service, Library of Congress. Michael John Garcia. April 8, 2015.
Securing the borders is an issue of perennial concern to Congress. Federal law authorizes the Department of Homeland Security (DHS) to construct barriers along the U.S. borders to deter illegal crossings. DHS is also required to construct reinforced fencing along at least 700 miles of the land border with Mexico (a border that stretches 1,933 miles), though Congress has not provided a deadline for its completion. At this time, fence construction has largely been halted, though DHS still needs to deploy fencing along nearly 50 additional miles of the southwest border to satisfy the 700-mile requirement.
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