Alexandre Boulerice is expected to announce that he is leaving the federal NDP and will run provincially for Québec Solidaire, according to Radio-Canada sources.

The announcement is expected on Monday.

Boulerice has long been rumoured to be weighing a jump to provincial politics.

He has held the riding of Rosemont—La Petite-Patrie since 2011 and is the only remaining NDP MP in Quebec. Before Boulerice’s 2011 electoral win, the seat was held by the Bloc Québécois for nearly 20 years.

It’s a major blow to the NDP — of which Boulerice was once deputy leader — which will only hold five seats out of a total of 343 in the House of Commons following his departure.

The Journal de Montréal first reported Boulerice’s move to provincial politics.

He is expected to run in the Montreal riding of Gouin in the upcoming provincial elections later this year.

The seat is currently held by former Québec Solidaire (QS) co-spokesperon Gabriel Nadeau-Dubois, who stepped down from that role in March 2025 and announced that he will not run for re-election in 2026.

The seat has consistently voted QS since 2012, but the party has lagged in the polls recently.

Poll aggregator Qc125 shows the party polling at around 10 per cent of the vote, behind all other major parties, with projections suggesting the party could get between two and eight seats in the next provincial elections.

The party currently has 11 seats in the 125-seat National Assembly.