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       Canada's Prime Minister Justin Trudeau talks during a news conference at the daycare inside Carrefour de l'Isle-Saint-Jean school in Charlottetown, Prince Edward Island, Canada, July 27, 2021. REUTERS/John Morris

       JOHN MORRIS/Reuters

       Prime Minister Justin Trudeau is planning to call a snap election for September 20 and will make the formal announcement this Sunday, four sources familiar with the matter said on Thursday.

       Trudeau aides have said for months that the ruling Liberals would push for a vote before the end of 2021, two years ahead of schedule. Trudeau only has a minority government and relies on opposition parties to push through legislation.