My take is that part of this is the fact that the US far right took an interest in Canada after the "trucker" convoy protest here during COVID. Multiple Fox seg

My take is that part of this is the fact that the US far right took an interest in Canada after the "trucker" convoy protest here during COVID. Multiple Fox segments on what a terrible "communist" place Canada is. And so it's become a brainworm in Trump's head, among a bunch of others. And a useful demagogic point to distract or rile up his base with. (Nevermind that DHS would have shot some of those protesters on site if the same kind of protests had occurred on the US side of the border. There's a reason the convoy was mobilized towards Ottawa and not to Washington, even though the vaccine requirements for truckers were actually a Biden regime initiative.) That and a generally liberal government holding power directly on your border, in the same linguistic/cultural/economic mileux has potential domestic consequences / threat.