Some foreign firms are taking a similar stance in response to Mr Trump’s new levies. In April Ferrari added up to 10% to the price of its cars. Britain’s Ineos said it would charge more for its Grenadier off‑roader. Canon, a camera-maker, has warned dealers to brace for price increases.

Politicians and industry leaders have long pushed to remove barriers to interprovincial trade. Trump’s tariffs are giving the effort new momentum.

With the Trump administration setting 15% as a floor for tariffs, companies and economists are warning of higher prices later this year.