Grassley was the one asking for that. Just found this article on the subject.
http://liveshots.blogs.foxnews.com/2010/03/03/exclusive-unknown-doj-lawyers-identified/
More than five years before that, Joseph Guerra, now Principal Deputy Associate Attorney General at the Justice Department, was one of five lawyers from the firm Sidley Austin to help three civil liberties groups, including the self-described "conservative" Rutherford Institute, file a detainee-related brief with the Supreme Court.The brief urged the justices to hear the case of Jose Padilla, a U.S. citizen who was held as an "enemy combatant" before the Bush Administration decided in 2006 to prosecute him in a civilian court..