What people don't get is that we've had TPA since the 70s:
"""""
For more than 30 years, Congress has granted the President TPA/fast track authority, agreeing to
consider trade agreement implementing legislation expeditiously and to vote on it without
amendment, provided the President meets certain statutory negotiating objectives and
consultation requirements, and the implementing bill contains the necessary and limited
qualifying provisions. TPA strikes a delicate balance by clarifying how Congress chooses to
exercise its constitutional authority over a particular aspect of trade policy, while presumably
giving the President additional negotiating leverage by effectively assuring U.S. trade partners
that a final agreement will be given timely and unamended consideration by Congress.
""""
This is also helpful, and is non-partisan congressional research: https://fas.org/sgp/crs/misc/RL33743.pdf
What people don't get is that we've had TPA since the 70s:
""""" For more than 30 years, Congress has granted the President TPA/fast track authority, agreeing to consider trade agreement implementing legislation expeditiously and to vote on it without amendment, provided the President meets certain statutory negotiating objectives and consultation requirements, and the implementing bill contains the necessary and limited qualifying provisions. TPA strikes a delicate balance by clarifying how Congress chooses to exercise its constitutional authority over a particular aspect of trade policy, while presumably giving the President additional negotiating leverage by effectively assuring U.S. trade partners that a final agreement will be given timely and unamended consideration by Congress. """"