Looks like the Army had already been investigating the problems at Abu Ghraib Prison. MS/NBC has published the complete report (quite long)
Cherry picking two choice excerpts:
The US Army Criminal Investigation Command (CID), led by COL Jerry Mocello, and a team of highly trained professional agents have done a superb job of investigating several complex and extremely disturbing incidents of detainee abuse at the Abu Ghraib Prison. They conducted over 50 interviews of witnesses, potential criminal suspects, and detainees. They also uncovered numerous photos and videos portraying in graphic detail detainee abuse by Military Police personnel on numerous occasions from October to December 2003. Several potential suspects rendered full and complete confessions regarding their personal involvement and the involvement of fellow Soldiers in this abuse. Several potential suspects invoked their rights under Article 31 of the Uniform Code of Military Justice (UCMJ) and the 5th Amendment of the U.S. Constitution.
I find that the intentional abuse of detainees by military police personnel included the following acts:
Sickening. This report goes on for quite a few pages.
This does the present administration a lot of harm. The only good news about it is that an investigation was underway — I could see wanting to keep this as quiet as possible. The bad news is that we had to learn about it through the media and not a press conference.