This is just a guess.
Between the US and Canada, I think Trump is going for free-er trade.
NAFTA was an agreement between bureaucrats and was for bureaucrats. Then, they screwed up whatever agreements by allowing each central bank to continue currency depreciation.
C$ went from 100 to 63. A blatant cheat.
It should be completely free trade with the C$ pegged to the US at par. No rules nor tariffs and no cheating on the currency.
Every great financial bubble has been followed by a severe contraction. That is when the world turns to protection. Politicians in each country have to do something about soaring unemployment at home.
Following the 1825 Bubble, it was called, in real time, the "Tariff of Abominations".
Avatar is the 68 Super, bought new.