When the U.S. Supreme Court hears arguments today in a landmark dispute over executive power in wartime, the Bush administration will be outnumbered — if not outgunned.

Many of the nation’s top law firms have signed briefs against the government and in support of Salim Hamdan, the detainee who allegedly served as chauffeur to Osama bin Laden and who is being detained at Guantanamo Bay, Cuba.