President Donald Trump on Thursday exempted goods from both Canada and Mexico under a North American trade pact for a month from the 25% tariffs that he had imposed earlier this week, the latest twist in fast-shifting trade policy that has whipsawed financial markets and business leaders. The exemption, which will expire on April 2, covers both of the two largest U.S. trading partners. Trump had earlier only mentioned an exemption for Mexico, but the amendment he signed to his order for 25% levies on imports from both – which went into effect on Tuesday – covers Canada as well.