The dollar strengthened rapidly this morning when Mr. Trump said he would impose a 25 per cent tariff on all products entering the US from Mexico and Canada, expanding its gains to 0.4 per cent. Non-US currencies fell across the board, with the Canadian dollar and Mexican peso falling the most, with the latter falling more than 1.2 per cent. Spot gold and silver came under pressure as the strong dollar also fell, with silver falling below $30 an ounce.