Prime Minister Justin Trudeau says a first tranche of retaliatory tariffs on U.S. goods will go into force at midnight if the U.S. goes ahead with blanket tariffs on Canadian imports.

If President Trump's tariffs against Canada take effect, Canadian Prime Minister Justin Trudeau said the U.S. would immediately face a raft of countermeasures on Tuesday. Why it matters: Trump's comments Monday that he would impose 25% tariffs on Canada and Mexico sent markets sliding amid fears it could start a trade war,

Canada's Foreign Affairs Minister Melanie Joly says if U.S. President Donald Trump goes ahead with tariffs as promised Canada is ready to respond with tariffs of its own. She says the tariffs are an existential threat to Canada and says the Trump White House is chaotic and Canada has to deal with that.

U.S. President Donald Trump says his long-threatened trade war is going ahead with tariffs on Canadian goods set to take effect just after midnight and there's nothing Canada can do to stop them.