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Scott Aitchison, a Conservative MP for Ontario's Parry Sound-Muskoka riding since 2019 and former mayor of Muskoka, is expected to resign from his position later this fall, according to sources cited by CBC News. This follows recent departures of other MPs who have left electoral politics in the past few months. Aitchison made an unsuccessful bid for the Conservative leadership in 2022, finishing fifth, and was previously named as housing critic under current leader Pierre Poilievre. His resignation would add to six currently vacant seats in the House of Commons.
Written locally by qwen2.5:14b on 2026-09-29,
using this article's own text rather than the other coverage of the
same event (that is the story summary below).
Story summary
Scott Aitchison, a Conservative MP for Parry Sound—Muskoka in Ontario since 2019, is expected to resign his seat by the end of the fall parliamentary sitting this year. Sources indicate that Pierre Poilievre, leader of the Conservative party, was informed last week about Aitchison's intention to leave. Aitchison had previously run for the party leadership in 2022 but finished fifth.
Aitchison's resignation will bring the total number of Conservative MPs leaving since the start of this year to eight and add another vacant seat to the House of Commons, where six seats are already empty. The riding he represents was considered a relatively safe Conservative seat; however, current polling suggests it could flip to Liberal control if there were an immediate by-election.
The announcement comes amid growing concerns within the party about its public image and declining popularity since Poilievre's leadership took over in 2025.
Written for “Scott Aitchison Resignation” on 2026-10-05,
grounded in this article and the 5 other(s) covering the same event.
Conservative MP Scott Aitchison expected to resign this fall: sources
asserted
Aitchison → expect → ?
Ontario MP and former mayor made bid for Conservative leadership in 2022
MP and former Conservative leadership candidate Scott Aitchison is expected to resign his seat later this fall, two sources tell CBC News.
asserted
sources → make → News
A senior Conservative source said Conservative Leader Pierre Poilievre was told last week that Aitchison plans to leave at the end of the fall sitting.
asserted
Aitchison → say → sitting
The MP's departure was going to be announced next week, the source said.
asserted
source → go → ?
CTV News first confirmed the news of his departure.
asserted
News → confirm → departure
Aitchison joins a list of Conservative MPs looking to exit electoral politics in recent months.
asserted
Aitchison → join → months
Prime Minister Mark Carney appointed former Conservative MP Richard Martel to the Senate early in the summer.
asserted
Carney → appoint → summer
Martel was sworn into the Red Chamber earlier this week.
asserted
Martel → swear → Chamber
Former MPs Cathay Wagantall and Larry Brock both stepped down in the past month.
asserted
MPs → step → month
The former Muskoka mayor launched a leadership bid in the 2022 Conservative campaign that saw Poilievre chosen as the party's chief.
asserted
Poilievre → launch → chief
Aitchison finished fifth.
asserted
Aitchison → finish → ?
Housing was a key feature of Aitchison's leadership campaign and Poilievre named the MP as his housing critic.
asserted
Poilievre → name → critic
Aitchison's office did not immediately return a request for comment.
asserted
office → return → comment
The resignation would create another vacancy in the House, where six seats are currently empty.
asserted
seats → create → House
In addition to Brock and Wagantall, former Liberal cabinet minister Steven Guilbeault officially resigned last month.
asserted
Guilbeault → resign → Brock
Former Liberal MP Shaun Chen resigned in mid-August.
asserted
Chen → resign → August
Former NDP MP Alexandre Boulerice and the Bloc Québécois's Simon-Pierre Savard-Tremblay both left federal politics to run in Quebec's provincial election.
asserted
Boulerice → leave → election
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