The Canadian Press Manitoba Premier Brian Pallister speaks to media following the delivery of Manitoba's 2019 budget, at the Legislative Building in Winnipeg on March 7, 2019.

WINNIPEG — Manitoba has joined a list of conservative-led provinces challenging the federal government's backstop carbon tax in court. Premier Brian Pallister says his government will ask a federal court to rule Ottawa has overstepped its bounds. "Ottawa cannot impose a carbon tax on a province that has a credible greenhouse-gas reduction plan of its own, and we do," Pallister said Wednesday. He also said Manitoba's court action is separate from those filed earlier in Saskatchewan and Ontario. "We'll observe other provinces' cases with interest and learn from them, but their cases are not the same as the one we would make." Manitoba, Saskatchewan, Ontario and New Brunswick refused federal instructions to enact their own carbon levies. That prompted Ottawa to impose its own tax, which started Monday. Watch: Ontario Premier Doug Ford slams feds' carbon tax

The initial rate of $20 per tonne, which works out to 4.4 cents on each litre of gasoline and drives up other fuel costs, is to increase every year until it reaches $50 per tonne in 2022. Saskatchewan challenged the constitutional authority of the federal government to impose the levy in a court case earlier this year. A ruling is expected in the coming weeks. Ontario's Progressive Conservative government has a court hearing later this month. Pallister said Manitoba's challenge will be different because the province had planned to bring in a carbon tax of its own, but at a lower $25 per tonne rate that would not rise each year. The premier dropped that plan when the federal government said it was not good enough. Liberal MP Terry Duguid, who represents Winnipeg South, said Pallister is taking the wrong approach. "Carbon pollution shouldn't be a partisan issue. If some Conservative politicians choose to not do what's right for our climate and our kids, we will," Duguid said in a written statement provided by the office of Climate Change Minister Catherine McKenna.

The Canadian Press Manitoba Premier Brian Pallister speaks to media after the reading of the throne speech at the Manitoba Legislature in Winnipeg on Nov. 20, 2018.