Canada is already examining possible retaliatory tariffs on certain items from the United States should President-elect Donald Trump follow through on his threat to impose sweeping tariffs on Canadian products, a senior official has said. Trump has threatened to impose tariffs on products from Canada and Mexico if the countries don't stop what he called the flow of drugs and migrants across southern and northern borders. He said he would impose a 25 per cent tax on all products entering the US from Canada and Mexico as one of his first executive orders. A Canadian government official said on Wednesday that Canada is preparing for every eventuality and has started thinking about what items to target with tariffs in retaliation. The official stressed no decision has been made. The person spoke on condition of anonymity as they were not authorized to speak publicly. When Trump imposed higher tariffs during his first term in office, other countries responded with retaliatory tariffs of