Prime Minister Mark Carney executed a swift cabinet shuffle on Monday, December 1, 2025, appointing former Immigration Minister Marc Miller as the new Minister of Canadian Identity and Culture and Minister Responsible for Official Languages. The shuffle was necessitated by the high-profile resignation of Steven Guilbeault last week, who stepped down to protest the federal government's new energy pact with Alberta that outlines a roadmap for a new oil pipeline to the Pacific coast. Guilbeault, a long-time environmental activist, stated he remains committed to environmental issues and strongly opposed the memorandum of understanding (MoU), despite having endorsed Carney in the Liberal leadership race earlier this year. Miller, a prominent Montreal MP who previously served in the Trudeau cabinet but was excluded from Carney's initial inner circle, returns to address a critical portfolio as the government faces pressure from the U.S. over Canadian content legislation, such as the Online Streaming Act and the Online News Act. The Prime Minister also named Minister Joël Lightbound as his new Quebec Lieutenant.