" An authoritarian leader has abruptly closed America’s borders to people from countries he doesn’t like. "

I dont ever recall anything in the US or Canadian Constitutions saying that every citizen in the world has the God given right to enter the United States (or Canada for that matter).  Throwing up your hands and protesting that people's human rights are being trampled because you are enforcing the rule of law and restricting border access is completely rediculous.

Any country can decide to allow, or disallow, any person, individual, corporate or business entity, transit across their borders on any grounds that they so choose.  It could be country of origin (like Trump's order), it could even be based on skin color, IQ, religion, or anything else, up to and including that some guy doesn't like the way that they look.

Thats why they call it a border.  It is the political division between one nation and another.  If you dont like it, go to a different country more to your liking.