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Former environment minister Steven Guilbeault is resigning as a Liberal MP and expected to break the news to his colleagues on Wednesday, CBC News has learned. Power & Politics asks Liberal caucus chair James Maloney what this departure says about caucus unity, as Guilbeault had made his concerns about the Carney government's environmental rollbacks clear ahead of his departure. Plus, P&P hears from former Alberta premier Jason Kenney about the province's referendum question — and the challenges ahead for Premier Danielle Smith.