Trump won't give a shit about Canada. 
A far right President and a far left P.M.
It's chalk and cheese. 
If NAFTA is open, it will end with a U.S. advantage. The milk lobby is already lobbying Trump's team to force us to get rid of our supply management system. 
Carbon taxes here; no carbon taxes in the U.S. That, immediately, puts our businesses at a disadvantage with Trudeau unlikely to respond.
Combined Provincial + Federal corporate tax in Canada is approx. 27%. Trump will lower U.S. corporate tax to 15%. Another disadvantage for us.
And in Ontario, we have a hapless left-wing Gov't raising hydro prices to record levels, while just over the border in the U.S., they're a fraction of the cost. Advantage US.

Trump is going to eat us for lunch because we are now run by left-wing Socialist morons with no business sense who see the giant iceberg up ahead but refuse on political principal to steer the ship in any other direction. 
Get your life preservers on and get ready for the impact!