FILE – In this June 27, 2006 file photo, reviewed by a U.S. Department of Defense official, U.S. military guards walk within Camp Delta military-run prison, at the Guantanamo Bay U.S. Naval Base, Cuba. President Barack Obama is pushing to overcome obstacles to closing the Guantanamo Bay prison, an elusive goal which has frustrated him since he took office. That is setting the White House on a collision course with Congress in its bid to loosen restrictions for moving out detainees. (AP Photo/Brennan Linsley, File)