Last-minute negotiations failed to halt the tariffs, which will hit $20 billion of Canadian products "In recent weeks, we made important progress toward improving Canada’s position as having the best deal in the world with the U.S. Key points and original sources are listed below.

• Last-minute negotiations failed to halt the tariffs, which will hit $20 billion of Canadian productsS1

• "In recent weeks, we made important progress toward improving Canada’s position as having the best deal in the world with the U.S. However, that progress has not been enough to meet our objectives for Canadians," Mark Carney said.S2

• CommentsS3

• The US has imposed a 50% tariff on $20bn (£14.6bn) worth of goods from Canada, which has vowed to retaliate against its historic ally.S4