Trump threatens Canada with 50% tariff on aircraft sold in US as feud with PM Carney expands In Trump's latest threat, the Republican president said he was retaliating against Canada for refusing to certify jets from Savannah, Georgia-based Gulfstream Aerospace. Washington:US President Donald Trump threatened Canada with a 50 per cent tariff on any aircraft sold in the US, the latest salvo in his trade war with America's northern neighbour as his feud with Prime Minister Mark Carney expands. But Trump's threat did not come with any details about when he would impose the import taxes, as Canada had already struck a deal. “If, for any reason, this situation is not immediately corrected, I am going to charge Canada a 50 per cent Tariff on any and all Aircraft sold into the United States of America,” Trump said in his post. Also Read:Trump warns of 100% tariffs on Canada if trade deal with China goes ahead