What is a parliamentary caucus?

A parliamentary caucus is the closed-door meeting of all Members of Parliament (and senators, in the case of the federal caucuses of recognised parties) from the same political party. The term originated in 18th-century Boston (with disputed etymology) and entered Canadian usage in the 19th century. Caucuses meet weekly during sittings of Parliament (typically Wednesday mornings in Ottawa) to discuss legislative strategy, debate internal party positions, and coordinate parliamentary business.

Caucuses serve several functions. As a venue for strategy, the caucus discusses upcoming votes, ministerial decisions (in the case of the governing party), and Opposition-day strategy (in the case of opposition parties). As a venue for internal party debate, the caucus allows MPs to question and challenge leadership decisions in private without public disagreement. As a venue for caucus solidarity, it builds team cohesion and a shared sense of party purpose. Caucus deliberations are confidential by convention (though leaks happen).

Federal caucuses include the Liberal caucus, the Conservative caucus, the NDP caucus, the Bloc Québécois caucus, and the Green caucus. Each caucus is led by the party leader (who chairs meetings or designates a chair), with caucus officers including the Whip, the House Leader (who manages parliamentary procedure), and various roles for specific issues. The Conservative caucus operates under the Reform Act, 2014 (Bill C-586), which requires explicit caucus votes on rules including caucus expulsion, leadership review, and the chair's election. The Liberal caucus has not formally adopted the Reform Act provisions.

Caucus dissent is the principal mechanism for MPs to influence party direction without publicly breaking with the leadership. Examples of caucus dissent include the 2019 Liberal caucus tensions over the SNC-Lavalin affair (which led to Jody Wilson-Raybould's and Jane Philpott's expulsions), the 2022 Conservative caucus revolt against Erin O'Toole (which produced his February 2, 2022 ouster as leader), and various smaller-scale caucus tensions. The Reform Act, 2014 strengthened caucus authority by requiring formal caucus votes for major decisions (such as removing the leader). Provincial Legislative Assemblies have parallel caucus structures.