Canadian Prime Minister Mark Carney said on Saturday that his country will impose retaliatory tariffs on the U.S. starting Sept. 8 in response to tariffs levied by the Trump administration on Canadian goods.

The U.S. imposed 50% tariffs on $20 billion worth of Canadian products early Saturday, and Canada immediately said it would retaliate after last-ditch negotiations failed to resolve the latest Trump-initiated feud.

At a press conference on Saturday, Carney said the retaliatory tariffs would apply to goods such as steel, dairy, appliances, agricultural equipment, pulp and paper, and electronics.

The Canadian PM said he took the step reluctantly, but added that it is in the best interest of Canadians.

“Reluctantly because we recognize that some of these measures will raise costs and reduce choice for Canadians,” Carney said, according to The Hill. “Reluctantly because we recognize that some U.S. companies and some U.S. states are innocent bystanders in a dispute that they did not want. Reluctantly because this trade dispute is preventing Canada and America from doing so much good that we could do together.”

“But at the same time, we take this step confident that it is in the best interest of Canada,” he said. “We cannot accept what they have offered, and we will not give what they have asked.”

The latest tit-for-tat tariff battle comes after negotiations between the two former close allies collapsed in Washington on Friday.

Carney accused Washington of using “economic integration as a weapon” and said “its signature was written in pencil,” The Associated Press reported. Carney added that he told Canadian negotiators to walk away.

But to Trump’s chief trade negotiator, Jamieson Greer, the U.S. took these drastic measures in response to a year of retaliation by Canada.

“We’ve said enough, and so we’ve taken countermeasures. Our interest is in protecting American workers and protecting American supply chains,” the U.S. trade representative told ”Fox & Friends Weekend.”

In a post on social media, Greer added, “Despite the U.S. offer to Canada to receive the best treatment of any major exporter to our market, new demands and walkbacks of other commitments by Canada have upended the careful balance reached in the past days.”