OTTAWA — Canada’s largest union is suing the federal government to stop it from ever again invoking the controversial legal tool the Liberals used to order striking Air Canada flight attendants back to work.

In a lawsuit filed on Monday, the Canadian Union of Public Employees (CUPE) — which represents over 750,000 members including Air Canada flight attendants — laid bare its outrage towards the airline and the Liberal government.

The union accused Jobs Minister Patty Hajdu of disregarding, undermining and nullifying the flight attendants’ constitutional right to strike by invoking section 107 of the Canada Labour Code to order an end to the strike.

The lawsuit asks a Federal Court judge to quash the minister’s decision and declare that the power she invoked is both unconstitutional and

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