McConnell should go nuclear for the sole reason that if he doesn’t Iran will.
Nailed it!
Going nuclear should be McConnell declaring it a treaty and abandon the Corker bill, then proceed with a treaty vote. The Corker bill has been violated in so many ways already.
The treaty clause in Article VI is still supreme law of the land, and McConnell can just declare the Corker bill to be nullified and that he is going to follow Article II Section 2.
Article II Section 2 gives the Senate the power to ratify treaties. Separation of powers gives the Senate in "advice and consent" the power to declare on its own authority what is and isn't a treaty. That's what "advice" means.
McConnell should say that it is the advice of the Senate that this is a treaty after all, and just proceed as such.
-PJ