Irrespective of the trade framework, Canada needs to diversify the markets for its products.  If it takes some sort of free trade agreement with China to gain a foothold there, then that's what it takes.  The same is true for the EU or the Mercosur countries.  There will always be a quid pro quo.  Today, close to 80% of our exports go to the U.S. - having that door shut on us through tariffs will be a disaster - the solution is obvious - seek the best deal possible with the U.S. - they will always be our largest trading partner, but reduce our dependence on that market with a target of growing our exports to the rest of the world so that our share to the U.S. drops below 50%.  Canada's economy can no longer afford to be at the mercy of a U.S. that has no interest in pursuing trade agreements on the basis of shared benefit.  As far as Trump and the GOP are concerned, our weaker currency and social safety net (including health care) are unfair trade practices.  There is no win to be had.