Eddie Goldenberg writes in The Globe and Mail on why—by entering into a bilateral deal with Mexico—the United States has unwittingly strengthened the hand of Canadian negotiators.

Eddie explains that the U.S Congress has extensive authority on matters of trade, and the Canadian government has been extremely successful in lobbying American legislators. And President Trump's threat of a 25-percent tariff on Canadian auto exports would devastate the U.S. auto industry too and impose huge costs on American consumers.