Conservative MP Larry Brock is resigning as the member of Parliament for Brantford-Brant South-Six Nations, according to three sources who spoke to The Globe and Mail (The Globe and Mail).

A source told the newspaper that Brock planned to tell his local riding association on Thursday night that he would leave at the end of the summer. The newspaper did not name its sources because they were not allowed to publicly discuss Brock's decision. Brock did not return calls from the newspaper.

Brock was first elected in 2021. Before entering politics, he worked as a Crown prosecutor — a lawyer who argues criminal cases on behalf of the government. He won his riding in the last election with 52 per cent of the vote. The riding of Brantford-Brant South-Six Nations was listed as "leaning" Conservative on 338Canada.ca.

Brock served as the Conservative justice critic until party leader Pierre Poilievre removed him from that role in June. A justice critic is a member of the opposition whose job is to question the government on crime and justice issues. Brock said at the time he was stepping aside for personal reasons. On June 30, 2026, Brock posted a statement on his official Facebook page titled "Statement from Larry Brock on Stepping Back from Shadow Cabinet," dated for immediate release (Facebook).

Brock will be the seventh MP to leave Poilievre's Conservative caucus since the 2025 election. The departures have happened for different reasons. Some MPs crossed the floor, which means they left one party to join another. Others were appointed to the Senate or retired.

Four MPs have crossed the floor from the Conservative caucus to the Liberals since the 2025 election. Saskatchewan Conservative MP Cathay Wagantall, the fifth person to leave, had said last year she would not run again but would finish her term. She then announced she would step down on Aug. 31. Quebec Conservative MP Richard Martel, the sixth departure, was appointed to the Senate by Prime Minister Mark Carney. A by-election — a special election held to fill an empty seat — for Martel's former riding of Chicoutimi-Le Fjord is scheduled for the end of August.

The Chicoutimi-Le Fjord contest carries its own political weight. Carney said the Liberals' choice of former dairy producer Daniel Gobeil to run in the riding shows the government supports supply management. Supply management is a system that controls how much farmers can produce and sets minimum prices for products like milk, eggs and poultry. The United States has said Canada's supply management makes trade talks harder. Poilievre visited the Chicoutimi-Le Fjord riding earlier in the week of the Brock report.

The broader context here is a Conservative caucus that has been getting smaller since the 2025 election, through a mix of floor-crossings, retirements, and now a resignation. Seven departures from one caucus in about eighteen months is a pace that will get attention from party organizers and House leadership. That is especially true because four of those members went straight to the governing Liberals. Each departure makes it harder for the Official Opposition to win key votes in Parliament and changes how committees are put together. Each one also triggers either a by-election or leaves a seat empty, which shifts the political map at the local level.

Brock's case is different from the floor-crossings and the Senate appointment. He was removed from the justice critic role in June, then released a public statement about personal reasons, and now plans to resign at summer's end. That is a quick path from holding a key opposition role to leaving Parliament. For a party that has made crime and bail reform a central part of its message, losing the MP who handled the justice file is a setback on top of the numbers problem.

The by-election timeline for Brantford-Brant South-Six Nations has not yet been set. Under the Parliament of Canada Act, a writ — the official document that starts an election — must be issued no later than 180 days after the Speaker of the House is told about the vacancy. That clock has not started yet, because Brock has not formally resigned his seat. He has only said he plans to do so at the end of the summer.