I’m not too familiar with the specific legal status of the OSCE in American law, I bet there’s a treaty or the other, but generally speaking a) you’re a member and b) you regularly send out your own people as OSCE mission members into other countries to observe elections and c) Every member state gets observed (alongside non-member countries inviting the OSCE because it’s a stamp of approval and can help stabilise democracies, establish trust in the procedures). Cursory observations are done for basically all elections that aren’t strictly regional, more in-depth ones every couple of elections. It’s democracies holding each other accountable.

If Bumfuck, TX, wants to make a statement against Canadians observing their elections that’s their god-damned right but it’s also the duty of Washington to shut them the fuck up.