Discussed here. Here’s just a small taste:
Multitudinous other lawsuits against the law remain outstanding, and at least a few of them still could result in the court invalidating the entire law at a later date….First, the suit with the largest potential reach – the one perhaps most likely, if the plaintiffs win, to cause the whole law to be invalidated – is a case out of Arizona called Coons v. Geithner. A state think tank called the Goldwater Institute is providing the legal firepower here, while two congressmen are among the plaintiffs. While the lawsuit incorporates challenges to the law on multiple fronts, its most legally explosive issue involves whether something called the Independent Payment Advisory Board (IPAB) is constitutionally permissible….In short, the suit alleges that IPAB amounts to an illegal “delegation” of legislative powers to an unaccountable board.