Prime Minister Justin Trudeau and Montreal Canadiens hockey player, P.K. Subban have started a festive Twitter challenge singing holiday carols.

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It all started when Subban, 26, tweeted to Trudeau saying: “You have great hair, but can you sing Jingle Bells?”;

//, 43, declared that he was up for the challenge saying: You’re about to find out. Sophie and I are warming up as we speak…”;

The goal of the campaign is to create a country-wide social media sing along for children at the Montreal Children’s Hospital and other pediatric hospitals