In a May 4 commentary (GOP: Lost Its Soul or Just Its Mind?), Dick Morris warns that President Obama could use Fast Track to require climate change regulation:

[I]n this era, a trade deal may not be just about trade. The administration could use the fast track authority to force through deals that are partly about commerce but that get into other areas such as immigration and climate change....

[E]nvironmental protections embodied in the agreement could be interpreted to require climate change regulation even in the absence of congressional authorization.

The administration is anxious to assure Congress that it has no such intentions, but we know that this president cannot be trusted to exercise restraint in using any power he has been granted.

And, once provisions for immigration and climate change are included in the treaty, they cannot be superseded or even modified by an act of Congress. The treaty provisions would have the force of the “law of the land” under our Constitution.

Senate majority leader Mitch McConnell of Kentucky plans to bring Fast Track up for a Senate vote, even though at least four Republican senators (Sessions, Graham, Burr, and Capito) and at least three potential Republican candidates for president (Huckabee, Trump, and Jindal) are opposed.

Ironically, McConnell may be about to give Obama the power to destroy McConnell's own state's coal industry!  Has he lost his mind?