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In the House of Commons Monday, Poilievre pressed Morneau to table that information.

“The measure of a society is how it treats its most vulnerable. That is why I asked how it is this carbon tax will impact on the poorest Canadians,” Poilievre said during question period. “At first, the government said, ‘No such data exists’. Then it said, ‘It exists; we just don’t want to tell you what it is.’ That is the current position of the government, that it wants to keep secret from Canadians, the most vulnerable Canadians, those with the least, the impact of this heavy new carbon tax on heat, hydro, gas and electricity.”

Trudeau has told provinces that they must, by 2018, put a price on carbon at a level high enough that they can help Canada achieve its international commitments to reduce greenhouse gas emissions. But he has also said on numerous occasions that he expects provinces to use whatever revenue they generate by pricing carbon to be turned back to the citizens of that province to help offset any increase in the prices of goods or services.

One of the documents Poilievre received under federal access-to-information laws is an internal finance department memo written on Oct. 20, 2015, in which the department tries to figure out the financial impact of a federal carbon tax on different kinds of voters.

The memo, titled “Impact of a carbon price on households’ consumption costs across the income distribution” was written by Jean-François Perreault. Perreault was then an assistant deputy minister at Finance Canada. He left the finance department in the spring of 2016 to join Scotiabank as its chief economist.