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A vehicle crossing the Gordie Howe International Bridge, connecting Windsor, Ontario and Detroit, Michigan, the day after it opened in Windsor, Ont. on July 28.Carlos Osorio/Reuters

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President Donald Trump’s latest round of 50-per cent-tariffs on $28-billion of Canadian exports are now in effect after a tentative trade deal between Canada and the U.S. collapsed less than an hour before a late Friday deadline.

Prime Minister Mark Carney said this weekend that he ordered negotiators to walk away from trade talks after the U.S. added punitive demands to the trade deal at the last minute. Mr. Carney also said Canada will retaliate to the tariffs “dollar-for-dollar” starting on Sept. 8.

On Monday, Mr. Trump issued a new threat and said he will raise tariffs on Canadian autos to 50 per cent and start tariffing auto parts on Jan. 1, 2027.

The Globe wants to hear your questions about the collapsed talks, which industries will be hit the hardest and what Canada’s path forward looks like. Share your thoughts in the box below, or send us an email at audience@globeandmail.com.

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