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".

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

U.S. President Donald Trump said on Thursday the United States would impose a 35% tariff on imports from Canada next month and planned to impose blanket tariffs of 15% or 20% on most other trading partners.