OK - now Canada needs to show some muscle to Donald.  Mike Myers once said: "Don't confuse our civility with weakness".  I agree.  I suggest we start putting together a list for Justin of all the matters that Canada can put on the table if they want to continue to be jerks in forming a new Trade Pact.  Please add to this list and maybe Justin could use these little tidbits if the US persists:

1.  Immediately institute an export tax on softwood lumber exports to the US, high enough to quadruple the cost of lumber.  The citizens of Texas, Florida, Puerto Rico and California (who all have to rebuild) can pay this export tax. 
2.  Stipulate that all material to be used in the building of the new US - Canada bridge at Detroit be Canadian.  (You will recall that the US refused to contribute financially to this project including their own customs house in Michigan).
3.  Cancel all consideration of Boeing aircraft for our Forces and start looking at the Eurofighter for our needs.
More?