Did you know that you don't have to be a natural born citizen of Canada to be it's Prime Minister and leader?
Yes. Donald Trump could be voted in as both the POTUS and the PM of its true north neighbor.
Now. To troll the federally funded media party of Canada it would be funny if this idea began picking up some legitimate steam in Canada.
If it's not a troll then the goal should be serious and on point and uncompromising. The political ascension of such a party would be accompanied with abolishing Parliament. Seizing crown land (yes king chuck's) and establishing a lawful Constitutional Republic to replace the corrupt government.
But it's just a troll.
Donald Trump will never be Prime Minister of Canada even though legally.... he could be.
Is there an American law which might prevent GEOTUS from governing all of North America?
British North American colonies that existed at the signing of the US Articles of Confederation were welcomed to join the Union in the future if it was their wish. There were three at the time-Newfoundland (including Labrador), Acadia (the Maritime Provinces), and "Canada" (Quebec). The admission of any of the other Provinces, like Alberta, would require a Constitutional amendment.
https://www.archives.gov/milestone-documents/articles-of-confederation