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

Canadian Prime Minister Justin Trudeau said Friday that if President-elect Donald Trump follows through on this threat to impose sweeping tariffs on Canadian products, he would be raising prices for Americans and hurting American business.

If they are imposed, the tariffs will hurt American consumers most of all. The North American supply chain is integrated; nearly $1trn-worth of goods crossed the northern and southern borders of the United States last year.

President-elect Donald Trump is threatening to impose sweeping new tariffs on Mexico, Canada and China as soon as he takes office as part of his efforts to crack down on