The Posse Comitatus Act does not prohibit US Military on our borders.
US Military is allowed as authorized by the Constitution or Act of Congress
http://www.unitedpatriotsofamerica.c...5/default.aspx
Donald Trump recommends troops on the border in an interview with Bill O'Reilly. See video
http://www.youtube.com/watch?v=-B2LD...mbedded#at=122
Comment appears at 1minute, 10 seconds into interview.