Canada's ruling Liberal Party lost a once-safe seat in a Montreal parliamentary constituency, preliminary results showed on Tuesday, a result likely to put more pressure on Prime Minister Justin Trudeau to quit.

Polling stations are open from 9 a.m. to 9 p.m. Elections Canada predicts the counting of ballots will be completed by midnight in Montreal even though the ballots have 91 names — making them the physically longest in the history of federal elections.