President Trump has attacked Canada again, and this time said that he will prevent the opening of a new bridge between the two countries. And this is ostensibly because of a long list of supposed grievances, up to and including something about China banning ice hockey. But the real story is more prosaic, and one that seems unlikely to go away any time soon. As much to do with the quiet but determined role prime minister Mark Carney has played in reflecting reality in his recent speeches, and the fact that Canada refused to bow down to Trump in order to get a supposed trade deal. Let's discuss.