Canadian Prime Minister Justin Trudeau announced 25% tariffs on U.S. goods in response to President Donald Trump's tariffs on America's northern neighbor.

New tariffs on Canada, Mexico and China went into effect Tuesday as part of President Trump’s effort to use trade measures to halt the flow of fentanyl into America – and Canada has already retaliated.

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,

Canadian Prime Minister Justin Trudeau announced on Monday night that his country will retaliate against the U.S. if President Donald Trump goes through with his plan for tariffs on Canadian goods, which are set to take effect at 12:01 a.

As Donald Trump's tariffs on Canada are set to activate, Canadian Prime Minister Justin Trudeau said he would respond promptly with tariffs for America. Canada Prime Minister Justin Trudeau said Monday that “there is no justification” for Trump’s tariffs.