Canada are not morons, they know that the best way to get Donald Trump's (short) attention span is to get him where it hurts:
- American coal exported via Canada -- shut that sucker down!
- Any US production subsidies (an there are a lot)
- Could go after US airlines -- after all US airlines don't pay the cost of air traffic operations...
Again the issue is that Trump doesn't understand his business (that of being President of the good old US of A). Canada can create massive pain for Trump, lets not forget that Canada has a $50 billion trade deficit with the US -- the pain will be far more one sided that Trump realizes.
Good weekend all