Justin Trudeau plays host at the G-7 meeting in Quebec on Friday, and there he’ll meet Donald Trump. I’d love to be a fly on the wall and hear what they say about the tariffs on Canada we announced last…

The latest meeting of what had been the world’s seven major economic powers left no doubt that the United States of America is far more than the foremost among them, and that longstanding differences between them continue to widen. The…