There is much that is baffling about Trump's needless unprovoked trade war against our closest neighbor, biggest trading partner, and quondam ally Canada. But perhaps the strangest point yet to emerge is the specific issue over which trade negotiations apparently broke down.
When Canadian Prime Minister Mark Carney declared yesterday that he was walking away from trade talks, he said that U.S. negotiators were insisting on concessions that were simply too extreme to be considered, and would implicate fundamental principles of sovereignty.