The merger of Holness' party and Ralliement pour Montréal last month created tension among candidates, with the two parties opposed on the protection of the French language and the funding of the police service.
Marc-Antoine Desjardins, the leader of the Ralliement pour Montréal party, said he was pulling out of the race for mayor of the borough of Outremont mere weeks after his party merged with Mouvement.
The merger of two Montreal political parties has fallen apart after Marc-Antoine Desjardins is bowing out of the race and cutting ties with Balarama Holness.