Justin Trudeau is facing arguably his biggest political crisis. Some two dozen of his own MPs have signed a letter calling on him to step down as leader of the Liberal Party. After a three-hour caucus meeting in Ottawa on Wednesday, Trudeau said his party is "strong and united" — words echoed by other Liberals throughout the day.

But are they? Political reporter and author Stephen Maher breaks down the growing tensions within the Liberal Party over Trudeau's leadership and just how numbered his days as party leader might be.

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