Prime Minister Mark Carney is appointing Tom Pitfield, his chief strategist and principal secretary, to the Senate of Canada, according to three Liberal sources who spoke to The Globe and Mail. The appointment, along with others, is expected to be announced Tuesday.

Pitfield has served as Carney's principal secretary since Carney became prime minister and joined the Prime Minister's Office in March 2025, according to The Globe and Mail. He played a central role in the government's artificial intelligence strategy. He is from Montreal and is expected to fill one of five vacant Quebec seats — the largest regional bloc among the 10 vacancies currently open in the 105-member upper chamber, which also include one each in Manitoba, New Brunswick, Newfoundland and Labrador, Nova Scotia and Ontario.

Carney is not expected to fill all 10 vacancies in this first round. Prior Globe and Mail opinion columns had reported Pitfield was expected to be named government leader in the Senate and given a seat in cabinet as part of the appointment — a combination that would put a sitting senator inside the government's inner councils rather than at arm's length from them, the arrangement that has generally prevailed since 2014.

That arrangement dates to a decision by Justin Trudeau, who removed all Liberal senators from the national caucus that year in response to the Senate expenses scandal, severing the formal tie between the governing party and its senators. The following year, Trudeau created an independent advisory board to recommend Senate appointments and opened applications to the public, moves meant to depoliticize the appointment process and distance the chamber from partisan discipline.

In May, Carney committed to keeping that advisory board in place. But the board, structured to include three permanent federal members plus two ad hoc members from each province or territory with a vacancy, currently has no one filling any of its provincial or territorial seats. Carney is expected to announce changes to how the board operates alongside the Pitfield appointment.

Pitfield's own history in Liberal politics runs deep and personal. His father, Michael Pitfield, was appointed to the Senate by Pierre Elliott Trudeau. Tom Pitfield is a personal friend of Justin Trudeau. In 2014 he founded Data Sciences, a firm that helped the Liberal Party build data operations to analyze and target voters — work credited with helping move the party from third place to a majority government in the 2015 election. He was involved again in the Liberal campaign in 2024.

The Pitfield appointment, if it proceeds as reported alongside a Senate government leadership role and a cabinet seat, would put a fixture of Liberal Party machinery directly inside a chamber that Trudeau spent a decade trying to present as independent of the party apparatus. Whether that reads as a reversal of the post-2014 model or simply a practical recalibration by a prime minister who needs legislation moved will depend on how the government leader role is actually exercised — and on what, if anything, replaces the vacant advisory board seats.

The stated rationale, according to prior Globe and Mail reporting, is procedural: giving Pitfield a mandate to move government legislation through the Senate efficiently. A government leader who sits in cabinet has more direct means of coordinating a legislative agenda across both chambers than one operating at arm's length, which was closer to the model Trudeau's Independent Senators Group architecture was designed to produce.

That architecture has itself been in flux. Senators are currently planning to form a sixth group in the chamber, according to iPolitics, amid open questions among sitting senators about what Carney's broader vision for the institution actually is. A cabinet-level government leader with a direct line to the Prime Minister's Office would represent one clear answer to that question, even if it is not the one the independent-senator model anticipated.

Quebec's five vacancies give Carney room to make several appointments in the province beyond Pitfield's, and the timing of Tuesday's announcement suggests he may fill more than one seat at once. The Manitoba, New Brunswick, Newfoundland and Labrador, Nova Scotia and Ontario vacancies remain unaddressed for now, consistent with reporting that this round will not clear the full backlog.

The mechanics of the advisory board's vacant provincial seats will matter for how the remaining nine appointments unfold. Without ad hoc regional members in place, recommendations for those seats would need to originate through some other process, or wait until the board is reconstituted in whatever revised form Carney announces.