It would be a situation similar to the TPP most likely.
You can see that I've stopped paying attention to actual policy issues.
So, based on the numbers I can find, the parties have become even more polarized. Republicans were somewhat more in favor of TPP than they were for NAFTA in 1993 (Senators 48-6 in favor, House members 191-55 in favor), while Democrats are MUCH more opposed (Senators 32-14 opposed, House members 160-28 opposed).
I'm actually somewhat surprised about both parties. For the Republicans, Donald Trump comes across as the voice of everything Pat Buchanan put in motion a generation ago, so I can't imagine him being pro-trade any more than Buchanan was. This is a nice reminder that Trump doesn't necessarily represent the mainstream of the Republican party.
I'm also somewhat surprised about the Democrats. I wasn't sure what to expect. If anything, I would have thought that the Gephardt/labor wing was weaker now than a generation ago. I never would have expected a change in the opposite direction to such a large degree.