Congress can't do by treaty anything that's not within their power to do directly. That being said, the New Deal Commerce Clause makes "what they can't do directly" pretty well non existent. To quote Clarence Thomas - "every blade of grass".
36 posted on 12/26/2006 9:09:15 PM PST by tacticalogic
("Oh bother!" said Pooh, as he chambered his last round.)