A government official says 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.

Trump, who takes office on Jan. 20, said this week he would impose a 25% tariff on all imports from Canada and Mexico until they clamp down on drugs and migrants crossing the border. Canadian oil imports would not be exempt under a free-trade deal from the levies, Reuters reported.

Donald Trump's proposed tariffs on Canada could increase U.S. gas prices by up to 70 cents a gallon, energy experts say.