After. After he left. On Twitter. Because that's how he rolls. Some might call that cowardly.
This article in The Globe and Mail, widely regarded as Canada's national newspaper, writes that Trumps Owes Trudeau an Apology.
It's a brief article so don't hesitate to click and read, but in case you don't here are a few excerpts.
Decent people do not belittle or mock their allies or their enemies. Decent people do not engage in juvenile name-calling. Decent people do not resort to personal attacks when they don’t like the outcome of a meeting ...
We are respectful and decent people. Over the past 70 years the U.S. has led the construction of an international order based on mutual respect, and worked on improving the joint and interconnected interdependence among nations.
But this recent behaviour is abnormal: Someone has to call out Mr. Trump.
We on this side of the border are pretty well all onside, for this is not an liberal-conservative issue. In fact Parliament has voted unanimously in favour of tariff reprisals. Unanimous voted, don't often happen, folks. (More here.)
I read everywhere in social media that Americans are appalled by this man's uncouth behaviour, but I am mainly writing this to say that we understand that this is not so much a Canada-USA brouhaha as it is a petulant man-child acting out.
I can say that I've never met an American that I haven't liked. Now, I am sure that they exist, but I haven't personally met any.
I just wanted to say that to y'all, eh: those last two words being an Americanism and a Canadianism.