WASHINGTON — U.S. President Donald Trump said 25 per cent across-the-board tariffs on imports from Canada and Mexico, with a lower 10 per cent levy on Canadian energy, will start Tuesday, tipping the continent into a trade war. WASHINGTON — U.S. President Donald Trump said 25 per cent across-the-board tariffs on imports from Canada and Mexico, with a lower 10 per cent levy on Canadian energy, will start Tuesday, tipping the continent into a trade war. "No room left for Mexico or for Canada (to make a deal)," Trump said at the White House on Monday. Trump's executive order to…