President Donald Trump will levy a 35% tariff on some goods coming into the US from Canada, in a blow to Canadian Prime Minister Mark Carney’s bid to avoid punishing levies on goods sold to the US. The tariff level would take effect from Aug. 1.

“Fentanyl is hardly the only challenge we have with Canada, which has many Tariff, Non-Tariff, Policies and Trade Barriers, which cause unsustainable Trade Deficits against the United States,” Trump said in a letter to Carney posted Thursday.