Conservative Leader Andrew Scheer adopted a sharp tone Sunday in his final news conference of the election campaign, warning that returning more Bloc Québécois MPs to Ottawa will result in another independence referendum in Quebec.

In his final pitch to millions of electors ahead of Monday's vote, Scheer said that voting Conservative is the only way to stave off a "costly coalition" between progressive parties and a revival of separatism in Quebec.

Scheer pounced on Bloc Québécois Leader Yves-Francois Blanchet's comment late Saturday night that separatism isn't an option now — with support for such a project low among Quebec voters — "but the time will come."

The Bloc leader said the "Quebec nation" should again consider sovereignty. Blanchet also quoted from past separatist leaders, like former premier René Lévesque, who extolled the virtues of an independent Quebec.

"We can once again tell our Scottish and Catalan friends that in the struggle for self-determination, Quebec is back on Monday," Blanchet said, referencing the two other sub-national regions that have considered independence.

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According to the CBC's Poll Tracker, the Bloc has seen a surge in support after strong debate performances by Blanchet and is now poised to win as many as 40 seats. In the last election, the Bloc secured 19.3 per cent of the Quebec vote, which produced just 10 seats for the nationalist party.

Vote Tory to stop Bloc: Scheer

Scheer said the Bloc leader — himself a former minister in a Parti Québécois government, the party that launched the last two independence referendums in the province — has made it clear his only purpose in Ottawa will be to advocate for separatism. He said voting Conservative will stop the Bloc's advance.

"At the 11th hour of this campaign he's admitted what we've known all along: his first priority is to work with the Parti Québécois towards a new referendum. That means a vote for the Bloc is a vote for a referendum. Another sign of the divisiveness Justin Trudeau has cultivated in our country," Scheer said.

Watch: Conservative Leader Andrew Scheer says the Bloc will immediately work with the Parti Québécois to hold a new referendum

In a short stump speech in Vancouver, Trudeau also addressed Blanchet's sovereignist pitch, saying that Quebecers should vote Liberal tomorrow so as to avoid reviving debates of the past. He said the Bloc doesn't want to fight the issues of our time — climate change, and affordability — but rather wants to return to debating the place of Quebec in Canada.

"That's not what want Quebecers want ... while other people are trying to divide us, we're going to stay focused on moving forward all together," Trudeau said.

But Blanchet said Sunday that he isn't advocating for separatism now and the federalist party leaders have deliberately twisted his words, calling them "liars."

Claims not true, says Blanchet

"I told my own people yesterday night that they have to understand this is not our mandate this time. I am absolutely certain that Mr. Trudeau knows it and that he is purposely lying to the Canadians," Blanchet said.

Watch: BQ Leader Yves-François Blanchet says he is not seeking a mandate this time for Quebec independence

"One day, at a time of their choice and in a matter of their own choosing, Quebecers might again consider giving themselves a country."

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