Carney Slams U.S.-Canada Trade Proposal and Vows Retaliation The New York TimesCanada sets retaliatory tariffs in response to 50% U.S. levies as trade talks fail The Washington PostU.S.-Canada trade talks collapse, setting new 50% tariffs in motion NBC NewsCanada Demand for Tariff Relief on Trucks Imperiled Trade Talks Bloomberg.comHow to Lose a Trade War The Atlantic