Canada’s retaliatory tariffs on $20 billion worth of U.S. goods are now officially in effect, with duties of up to 50% hitting steel, aluminum and dairy imports while energy remains exempt. President Trump is threatening to block Canadian jet maker Bombardier from U.S. sales unless it builds domestically, while Prime Minister Mark Carney is urging Washington to “stop throwing shade” and get serious. Canadian exports to the U.S. have now dropped to 66%, down from 72% last year, as the trade war escalates.