U.S. President Donald Trump on Thursday announced a 35% tariff on Canadian imports, starting Aug. 1, citing that Ottawa had retaliated with tariffs against Washington.

“Instead of working with the United States, Canada retaliated with its own Tariffs,” Trump said in his letter to Mark Carney, prime minister of Canada, posted on Truth Social.

He attributed fentanyl as a reason for the rate in the letter and said: “If Canada works with me to stop the flow of Fentanyl, we will, perhaps, consider an adjustment to this letter.”

The 35% tariffs will be separate from all sectoral tariffs, Trump said, threatening that the duty might be increased, if Canada continues to retaliate.

“If for any reason you decide to raise your Tariffs, then, whatever the number you choose to raise them by, will be added onto the 35% that we charge,” Trump said in the post.

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