Canada has been so close to the US we would lovingly joke about it being "the 51st state". Canada's cities are all pressed up against the US border precisely because it's so tightly economically integrated with the US. We share the world's longest undefended "border" for a reason.
The small minded neofascists think that someone being part of their sphere of influence must mean they can shit on them, tell them it's caviar, and they'll lap it up and come back for more. It's like they can't see that Canada (along with most of the rest of the world) was already strongly aligned with the US, in favor of some stupid imagined written on paper "ownership" direct-command relationship. They really can't get past the two bits in front of them and see larger constructive situations, at all.
(I'm of course talking about all the useful idiots cheering this on, and enabling it by not impeaching. The Manchurian Candidate himself is just following the directions of Russia/China supplied by his handlers directly into his cancerous ego.)