Canada is preparing to retaliate with an exhaustive list of tariffs on American goods if President-elect Trump follows through with his plans to add a steep 25% import tax on Canadian exports, people familiar with the matter told CNN.

Canada is drawing up plans for extensive tariffs against US products if Donald Trump follows through on his threat to put 25% levies on Canadian goods, according to people familiar with the matter.

Trump has threatened a tariff on goods from Canada if the country does not clamp down on immigration and the flow of drugs across its border with the U.S.