Obviously, harmful to Canada - not so much to the USA.  What concessions will Trump demand?  What will be negotiable?

I don't know about the Liberal's policy to invite Trump to trade talks ASAP.  Hopefully, Trudeau's generally admirable "win more flies with honey" attitude - and Canada's experienced trade negotiators - make it work out.  However, I can't help but believe Ivison  that Canada is revealing all its cards before sitting at the table.

In fairness, there isn't much Canada can do when the USA turns to a protectionist attitude.