Not sure what Trump's endgame here is other than alienating once allies and economic partners. Trump went instantly to nuclear and Trudeau was forced to respond in kind. This is what happens when diplomacy is little more than namecalling and 'my way or the highway.' The USA isn't this unstoppable juggernaut everyone must bow down to and accept being bullied from. Europe, China, Japan, Russia, Brazil, Turkey, etc are all vying for influence and will take advantage of our every misstep. Europe certainly did today.