Rob told you earlier that the Obama Administration admits what everyone could plainly see about why the Iran nuclear deal wasn't treated as a treaty. Because the Constitution requires treaties to be ratified by the Senate, and Obama and Kerry know there's no chance of that happening with this turkey.
That's obviously a blatant disregarding of the Constitution, but that's hardly unusual for this administration. What is harder to understand is why a Republican Congress went ahead and passed the Iran Nuclear Agreement Review Act, which created a statutory if clearly unconstitutional process by which Obama can still get something like congressional approval even if all he's doing is just barely sustaining the veto of an act of disapproval. There is already a process by which the president can get approval. It's called treaty ratification, and it requires two-thirds of the Senate. For congressional Republicans to give Obama an alternative to that is one of the most mind-blowingly stupid things I can ever remember them doing. And that's saying something.