OTTAWA — After talking up the prospect of cross-party collaboration in the House of Commons, Liberal and Conservative MPs wasted little time after Parliament resumed Monday before reverting to partisan attacks over housing and the cost of living.

The tone was set early Monday afternoon, when the first-ever question period exchange between Prime Minister Mark Carney and Conservative Leader Pierre Poilievre began cordially before turning belligerent.

“When I left, there was a Liberal prime minister who was making excuses about breaking promises, running massive deficits. Costs, crime, chaos were all out of control,” Poilievre said. “Whereas today… we have a Liberal prime minister breaking promises, making excuses, running massive deficits with costs, crime and chaos out of control.”

“I un

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