Trump wrote to Carney to inform him that, from August 1, Canada will face a 35 percent import tariff after the two sides failed to reach a deal during the recent pause. The American leader said he would consider revising the 35 percent tariff "if Canada works with me to stop the flow of Fentanyl".

President Donald Trump reignited America’s on-again, off-again trade war with Canada on Thursday in a catty letter to Prime Minister Mark Carney. Trump threatened to impose a 35 percent tariff on Canadian goods beginning Aug.

The president revived his discredited claims about fentanyl entering the U.S. from Canada to justify his latest proposed rate of 35 percent.