Canada's Prime Minister Justin Trudeau speaks at a meeting of the Calgary Chamber of Commerce in Calgary, Alberta, Canada December 21, 2016. REUTERS/Todd Korol

Prime Minister Justin Trudeau faced a growing backlash on Tuesday over exempting home heating oil from the government's carbon tax, with Saskatchewan threatening to stop collecting the levy altogether.

Amid calls to provide relief from soaring costs of living, the Liberals last week announced a three-year carbon tax exemption for home heating oil that advantages voters in Atlantic provinces.

Western provinces, which mostly use natural gas to heat homes, cried foul.

The Atlantic region is a Liberal stronghold, but Trudeau's support in the four coastal provinces has plummeted since June when the carbon tax came into effect there.

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