The people leading Canada’s trade talks are not as worried as you might think about Donald Trump’s latest threats to end North American free trade. It was somewhat jarring, this week, to take in the calm demeanour projected by chief trade negotiator Janice Charette, at an automotive conference, and lead cabinet minister Dominic LeBlanc, and ambassador Mark Wiseman at a Canada-U.S. summit convened by the Eurasia Group.