Walter Olson of the libertarian-leaning CATO Institute told me that he likes some things the administration has done unilaterally but that the statutory authority may be "on thin ice." Olson also observed that after years of railing against activist courts, suit-happy Republicans don't quite have the high ground.
Neither does the can't-work-with-others president. As a constitutional law professor, Obama should not need the House Judiciary Committee to tell him, "If the President disagrees with that law, he must convince Congress to change it." Now he's arguing with himself -- gearing up to deport children, encouraged by his own directive.