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Scott Aitchison, a Conservative MP from Parry Sound–Muskoka, Ontario, is set to resign from Parliament as early as Wednesday, making him the eighth MP to leave Pierre Poilievre’s caucus since the 2025 election. Sources indicate that Aitchison informed Poilievre of his intention to resign last week but did not provide a specific reason beyond a desire for change after three decades in elected office. This development adds to growing questions about Poilievre’s leadership within the party, as it marks another significant loss from an already weakened caucus.
Written locally by qwen2.5:14b on 2026-09-30,
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 will announce his resignation from Parliament as soon as Wednesday, Global News has learned.
asserted
News → announce → Wednesday
Aitchison will be the eighth MP to leave Pierre Poilievre’s Conservative caucus since the 2025 election.
asserted
Aitchison → leave → election
Aitchison was in Newfoundland and Labrador Tuesday and did not respond to questions but a source who requested anonymity and who is in close contact with the Parry Sound – Muskoka MP said he informed Poilievre a week ago about his intention to resign his seat.
asserted
he → respond → seat
Aitchison, who ran and lost against Poilievre for his party’s leadership in 2022, is expected to provide more details about the timing of his resignation when he issues a statement either Wednesday or Thursday.
asserted
he → run → statement
The source said he expects Aitchison will resign before the House of Commons rises for its Christmas break in December.
asserted
House → say → December
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The Hill Times first reported that Aitchison was likely to resign his seat.
asserted
Aitchison → get → seat
Aitchison, 53, was first elected in 2019, taking over the Ontario cottage country riding that had been held by Tony Clement from 2006 to 2019.
asserted
that → elect → 2019
The riding should be considered a relatively safe Conservative seat though Liberal Andy Mitchell held the riding from 1993 to 2006 and made it into former prime minister Paul Martin’s cabinet.
asserted
Mitchell → consider → cabinet
The source close to Aitchison did not provide any specific reason for Aitchison’s decision other than to say that, after 30 years as an elected official, Aitchison believes it is time to try something else.
asserted
it → provide → something
Aitchison worked in financial services and real estate before becoming the mayor of Huntsville, Ont. in 2014.
asserted
Aitchison → work → 2014
He was first elected to the town council in Huntsville at the age of 21.
asserted
He → elect → 21
He is seen as a centrist in the Conservative caucus and was his party’s housing critic.
asserted
He → see → caucus
Earlier this year, Aitchison and Conservative deputy leader Melissa Lantsman led a fundraiser for LGBTQ+ refugees, an initiative that was seen as a way for the Conservative party to demonstrate its support for the rights of gender and sexual minorities.
asserted
party → lead → minorities
“We’re all God’s creatures and we’re all loved, and we all deserve to be loved and we all deserve to feel safe and secure,” Aitchison told The Canadian Press in June.
asserted
Aitchison → ’re → June
“I believe that it’s important for all of us to — not to preach that, but to demonstrate that.”
asserted
all → believe → that
The departure of Aitchison is sure to raise yet again, more questions about Poilievre’s leadership.
asserted
departure → raise → leadership
Since the spring of 2025, four MPs deserted the Conservative benches to sit with Mark Carney’s Liberals; one left to sit in the Senate as an independent; and three, including Aitchison, have simply quit politics.
There are currently six vacant seats in the House of Commons and, when Aitchison makes his announcement, there will be seven.
asserted
Aitchison → desert → announcement
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