Canada imposed retaliatory tariffs against the United States as the two neighbors slide toward an all-out trade war. The tariffs will hit a range of U.S. products, from industrial goods to everyday items. At the same time, President Trump is threatening Canada with even steeper tariffs. William Brangham reports.

To discuss the trade war and deteriorating relations between the U.S. and Canada, Geoff Bennett spoke with Canadian trade representative Dominic LeBlanc, a central figure in negotiations with the United States.