As a Canadian, I'm shocked at the attention the minutia of US politics gets in Canada. I was visiting family and watching the 6pm news and I'd say US politics dominates Canadian national news. It's not unusual for the first 20 min of a 30 min program to be nothing but US politics. Plenty of people say "well, what happens in the US is important to Canada", but what's covered is just stupid political bickering. And it's not even coverage from a Canadian perspective, just regurgitation of what's covered in the US.
Sure, when Trump says something about renegotiating NAFTA, yeah, cover that. When Trump says something stupid about the Democrats, no, that doesn't deserved prime time coverage in Canada. There are too many important things happening in Canada and the rest of the world for that to be front and center.
But I understand why they do it...ratings. Covering outrageous stories gets ratings. Generating outrage gets people to tune in tomorrow to see what happens next.