Donald Trump has been keeping Canada on its toes since he became US president at the start of last year. When it comes to matters of trade, Mr Trump has been resolutely hawkish, vowing repeatedly to put “America first”. As the US is far and away Canada’s largest trading partner, this has inevitably caused concern north of the border. And given that Mr Trump has repeatedly threatened to tear up the 1994 North American Free Trade Agreement (Nafta) between the US, Canada, and Mexico, alarm in Ottawa has been somewhat justified. Especially as Donald Trump’s administration has already hit Canadian softwood lumber with import tariffs of more than 20%.