One of the most remarkable aspects of the Trump presidencies is how he makes so much obscure law return to the fore. It has been well documented how much of the Constitution Trump has implicated. Indeed, one could write an entire book about Trump and the Constitution. (I plan to write a trilogy on the topic.) But Trump also affects other aspects of the law.
The latest instance comes in comments Trump made about Greenland. Trump said:
"The fact that they [Denmark] had a boat land there 500 years ago doesn't mean that they own the land."