Trump, who takes office on Jan. 20, said he would impose a 25% tariff on imports from Canada and Mexico until they clamped down on drugs, particularly fentanyl, and migrants crossing the border, in a move that would appear to violate a free-trade deal.

Mexico has supplanted China as the main source of goods, but imports keep climbing.

Chinese state media has cautioned that President-elect Donald Trump’s pledge to impose additional tariffs on Chinese goods risks igniting a devastating tariff war between the world’s two largest economies.