Every populist, reading from the Big Book of Nastyism, requires a fake enemy to distract from the fact he isn't doing anything. Trumpies started with the Chinese but found they were required for North Korea. He has settled on Canada.
But we'll get our revenge. He has got the Oklahoma earthquake zone really popping with increased fracking. Won't be long now before the earthquakes stop all US fracking. Then they'll pay through the nose for Canadian oil. :)
Next, we'll expect an attack on maple syrup.