Amazon.com Inc.’s decision to close all seven of its warehouses in the Canadian province of Quebec and terminate more than 1,900 workers is prompting legal action from the affected union.

A union that represents some Montreal Amazon workers said it will petition a court to compel the company to reopen the warehouses and reverse the job cuts.

After Amazon announced it would shutter its Quebec warehouses, costing 1,700 workers their jobs, a Canadian union said it would strike back.