1 trillion $$$ US taxpayers

Illegal immigration costs American taxpayers $113 billion a year, according to a 2010 estimate. The annual legal immigration of lower-skilled workers also costs Americans many billions in welfare, and reduces salaries and wages. The cross-border drug trade also imposes huge costs on American communities. spending for the wall would be legally authorized by a long-standing 2006 law, which allows the federal government to build 700 miles of double-layer fencing on the border.