After his promises to protect Canadian voters from U.S. President Trump, Prime Minister Mark Carney must make quick work of a radical plan: decoupling Canada’s economy from its biggest trading partner and, lately, its biggest threat.

Carney, a technocrat who ran the Bank of Canada during the financial crisis and the Bank of England during Brexit, won Canada’s national election on Monday on the strength of his assertion that he is the right leader to take on Trump. Success means unwinding a Canadian foreign policy that since World War II has centered on building a closer union with the U.S.

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