OTTAWA—More Conservatives are considering decamping to the government benches, new Liberal MP Chris d’Entremont says, while some New Democrats are now signalling they may oppose a vote critical to the survival of Mark Carney’s minority Liberals.

D’Entremont, who on Tuesday stunned his former colleagues by leaving Pierre Poilievre’s Conservatives to join the Liberal ranks, said at a news conference Wednesday that other Tory MPs were mulling decisions similar to his own.

“I would suggest that there probably are those that are in the same boat, but I will let them tell their stories, if that time comes,” d’Entremont said.

The floor crossing brings the Liberals within two votes of having a majority in the House of Commons, as Tuesday’s budget is primed to face a confidence vote that could t

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