No, Canada and Mexico should not walk away from negotiations.

That hands RC an easy victory if his intent is to drive Canada and Mexico away from negotiations. 

RC intends to end NAFTA one way or another. Why give him an easy victory? Make him fight for it. 

If we do not walk away he cannot claim that negotiations have failed, only that they will take a lot longer than expected. There are a lot of legislators who do not want to lose NAFTA, particularly because of the actions of an idiot. RC needs a win. He wins if we walk.

DO NOT GIVE IT TO HIM!!!!!!!!

Your approach is defeatist. I hope our negotiators can come up with something better. I have a novel idea if those peons want to hear it.