President Bush, May 24, 2004: Abu Ghraib is a "...symbol of disgraceful conduct by a FEW American troops who dishonored our country..." (my emphasis). Bush's speech is here.
The Bush Administration in a 2003 internal memo: "we do not believe that Congress enacted general criminal provisions such as the prohibitions against ... torture pursuant to any express authority that would allow it to infringe on the president's constitutional control over the operation of the armed forces in wartime."
The long memo is here. Read about it here and here.