Summary: It's the first time it's happened since at least Confederation: the border between Canada and the U.S. is closed to all but essential traffic. And that's not all that's transpired in these strange times. Steve Paikin talks about ties between the two countries with Bruce Heyman, the former U.S. ambassador to Canada under the previous American administration, and author of "The Art of Diplomacy:Strengthening the Canada-US relationship in Times of Uncertainty."
