Justin Trudeau hit back at Donald Trump with tariffs on imported American goods after Washington halted exemptions on exports to Canada. Canada, Mexico and the EU had been exempt from the 25% tariff on steel and the 10% tariff on aluminum. Ottawa’s decision to retaliate with $16.6 billion worth of trade tariffs on the US has been described by Foreign Minister Chrystia Freeland as the ‘strongest trade action Canada has taken in the postwar era”.