The imbalance in President Trump’s treatment of America’s closest trading partners may come from his desire to make Canada the 51st state, some Canadians believe.

President Trump announced Thursday that he would grant a 90-day extension to Mexico to allow for further trade negotiations, but the white house did not extend the same courtesy to Canada.

Canada's main stock index slipped on Friday as investors assessed U.S. President Donald Trump's new tariff regime that included levies on Canada and dozens of other countries. The S&P/TSX composite index was down 1.