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Saskatchewan, Ontario and Alberta want the Supreme Court of Canada to hear their challenges against the federal carbon tax simultaneously, as the provinces move to synchronize their battle plans.

At a meeting of attorneys general from those three provinces and New Brunswick in Saskatoon on Tuesday, Saskatchewan Justice Minister Don Morgan said the top court doesn’t generally rule multiple times on similar cases in quick succession, and “will likely direct that they’re all going to be heard together.” The province has asked the Supreme Court to delay its hearing of Saskatchewan’s legal challenge until 2020 to better coordinate with the other provinces.

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Alberta Justice Minister Doug Schweitzer said there was “some merit” in having the cases heard in tandem. Alberta will file documents in its own legal challenge with the Alberta Court of Appeal by the end of the week. Saskatchewan and Ontario have both already lost their cases at their respective appellate courts.