TPA is not a treaty, it’s not even a trade bill. And it’s not secret. If had read it you would see there’s not one non-US nation mentioned in it. It pertains only to rules and authority to be observed by Congress and the President.
No kidding. I was obviously referring to the section of the TPA that sets the votes needed for passage of the TPP and yes the scope of these trade agreements makes them a treaty Constitutionally.