Do you really want to hinge your case on Congress' ability to delegate power? I mean that COULD be a fun court case if you want to have it and make it a constitutional issue, because the whole executive branch, and the executive branches of every single state, would be ripped to shreds :D
1 million unemployed in the federal government, upwards of 15 million in the states!
but thats only possible if you believe the Supreme Court's rulings are based on a strict understanding of the constitution they are all reading, or if it is based on the past of least resistance. (its the latter)
the above argument has a thin chance of surviving in 2017