Canadian Prime Minister Justin Trudeau told U.S. President Donald Trump that his new tariffs on Canadian imports were "a very dumb thing to do" – and that Canada would strike back immediately.br br Trudeau, speaking hours after Trump launched a trade war against Mexico and Canada, said Canada was imposing immediate 25 tariffs on C$30 billion worth of U.S. imports and if need be, would target another C$125 billion worth in 21 days' time.br br Trump's actions are unprecedented and threaten to severely damage relations between the trading partners.