The Nixon-era procedure, which allows trade pacts to be signed before Congress approves them, and then to be railroaded through Congress in 90 days with limited debate and no amendments, is deemed essential to implementing the Trans-Pacific Partnership (TPP). But an interesting thing happened on the way to the long-delayed submission of the Fast Track bill.
The world has benefited from the opening of trade over the last four decades. But this opening has been selective so that, at least in the U.S., most of the gains have gone to those at the top. It's possible to design trade deals that benefit the population as a whole, but not when corporate interests are literally the negotiators at the table.