NDP expected to choose interim leader Monday evening: sources

New Democrats are expected to select an interim leader on Monday evening when the party's federal council is scheduled to meet, according to party sources.

The federal council is meeting after the party achieved its worst showing in its history on election night. Leader Jagmeet Singh lost his B.C. seat and announced on the spot that he would be resigning.

CBC News agreed to not name the party sources because they were not authorized to discuss leadership plans.

Seven incumbent MPs out of a caucus of 24 are returning to the House of Commons, leaving the NDP without recognized party status. This leaves the New Democrats with fewer opportunities to speak during question period and no additional budget for the leader's office or research bureau. The NDP also won't be guaranteed seats on standing committees to shape government legislation.

After a devastating election, the party's caucus met on Thursday to take stock and discuss next steps.

The NDP's constitution states that the party's federal council, in consultation with the parliamentary caucus, appoints an interim leader until a permanent one is chosen by party members.

The federal council is separate from the NDP's caucus of MPs.

While MPs represent constituents in their ridings, the NDP's federal council is the party's largest governing body between national party conventions, and it represents the NDP membership.

The interim leader does not have to be an MP.

On Tuesday, the party's lone Quebec MP and deputy leader, Alexandre Boulerice, told Radio-Canada he is interested in the interim job but closed the door on running to replace Singh.

Nycole Turmel was interim leader in July 2011 after former leader Jack Layton stepped aside for cancer treatment. Layton died in August of that year.

At the time, the NDP formed the Official Opposition for the first time, and Turmel served until the party selected its new leader, Thomas Mulcair, in 2012.

Turmel said she wasn't surprised by Monday's election result, but was still saddened by it.

Although the party is far from where it was in 2011, Turmel said the next interim leader has a critical role growing fundraising and assisting the party in pulling off a successful leadership race.

Even though New Democrats may not hold official party status, she notes that the NDP and Bloc Québécois still have the balance of power in this minority Parliament. Turmel said the NDP's interim leader may have an important role in negotiating with the Liberals and other parties.

"I have to say it is a lot more important than people think," Turmel told CBC News. "I think it is important for [the new interim leader] to raise their voice and make it clear what they want."

The party's sole Vancouver Island MP, Gord Johns, also called Monday's result difficult and said the party has much internal work to do.

"I think we have some rebuilding … I'm not gonna deny that," Johns said in an interview with CBC Radio's The House.