Legal teams are midway through a hearing over whether one vote truly swayed an election in a Montreal suburb

The case of a single vote which determined the outcome of a federal election in Canada risks sending the “disastrous message” to voters that “some votes count more than others”, says the lawyer of a former MP as a court considers whether to void the controversial election and hold a new vote.

Legal teams in Quebec are midway through a three-day hearing over whether a single vote – and an administrative error – truly swayed a recent election in a suburb north of Montreal.

Bloc Québécois member Nathalie Sinclair-Desgagné lost the electoral district of Terrebonne to Liberal Tatiana Auguste in the April vote.

The Liberals currently hold 169 seats in the House of Commons, just shy of the 172 needed to form a majority. The Bloc Québécois holds 22 seats.