Gregory Ablavsky, Marion Rice Kirkwood professor of law at Stanford Law School in California, says Trump would have a difficult time trying to halt Jay Treaty rights.

“An executive order cannot — as a matter of constitutional law — repeal a treaty right,” he said.

“It would take an act of Congress in order to repeal a treaty right. Also, the Jay Treaty free passage right has also been codified into a federal statute, so that also is a matter of federal law.”