Why 172 Is Not the Magic Number

Enough to survive, not enough to thrive

In the wake of Matt Jeneroux’s floor crossing, a tidy narrative has taken hold in Ottawa. If the Liberals win the upcoming by-elections, particularly Terrebonne, while holding University–Rosedale and Scarborough Southwest, they could reach 172 seats and reclaim control of the House of Commons. Smooth sailing for three more years!

There is no question that reaching 172 would significantly improve the government’s position and provide it with considerably more stability in confidence matters.

But 172 is not a silver bullet.

The House of Commons is governed not only by arithmetic but by convention, procedure, and legitimacy. A mathematical majority does not automatically translate into operational control.

If the Liberals seek to control the House rather than simply stabilize it, they will require more than 172 members – at a minimum 173.

Control Means Committees and the Clock

Control is not limited to surviving confidence votes. It means controlling committees and controlling the legislative clock.

So long as the Speaker is a Liberal member, both require more than 172.

At present, the Bloc Québécois and the Conservative Party of Canada together hold the balance of power on House committees. That structure was deliberately entrenched at the beginning of the session. By unanimous consent, the government embedded committee membership in the Standing Orders “for the duration of the 45th Parliament.”

The composition is five Liberals, four Conservatives, and one Bloquiste.

House Motion amending Standing Order on striking of committee

Even if the Liberals reach 172 through by-elections or further floor crossings, committee control does not automatically change. Some have suggested prorogation would reset committees. It would not. Because membership was fixed for the duration of Parliament, prorogation alone does not undo it.

To alter the status quo, the Standing Orders must be amended. That requires a vote, either with opposition agreement or through the force of a majority.

At 172, neither route is secure.

The Speaker Constraint

If the government attempts to proceed without cooperation, it will likely rely on time allocation to curtail debate. Time allocation requires a majority vote.

On paper, 172 to 171 appears sufficient.

In practice, it may not be.

Under the Constitution Act, the Speaker votes only in the event of a tie. This “casting vote” is guided by conventions designed to preserve the authority of the Chair as an impartial arbiter. The Speaker is expected to preserve the status quo, allow further debate where possible, and avoid altering rules or legislation absent a clear majority.

Using a tie-breaking vote to amend Standing Orders entrenched for the duration of Parliament would strain those conventions. So would using it to impose time allocation and cut off debate.

For the Speaker to cast such votes would diminish the neutrality of the Chair and undermine confidence in the Speaker’s credibility within the House. A casting vote that reshapes committee control or curtails debate would inevitably be interpreted through a partisan lens.

The implication is straightforward. At 172, procedural change would still depend on opposition cooperation.

Traditionally, a government elected with a majority receives a majority on committees. That legitimacy flows from the ballot box. A majority assembled through floor crossings presents a different democratic argument. Opposition parties could plausibly contend that voters elected a Parliament designed with checks and balances, and that committee composition should continue to reflect that electoral outcome.

In that context, collaboration is not compelled.

A functional procedural majority therefore begins at 173.

The Empowered Backbench

Even at 173, longer term fragility will remain – but that fragility may come from inside the government caucus.

A one-seat cushion empowers every backbencher – as a single member could stall legislation, defeat procedural motions, or barter support in exchange for concessions. Each vote becomes pivotal. Party discipline must be exacting. Stability hinges on caucus cohesion.

Prime Minister Mark Carney has already faced signs of dissent. Nate Erskine-Smith (Beaches-East York) voted against Bill C-5, the One Canadian Economy Act, underscoring that unity cannot be assumed. The Senate – composed largely of independent parliamentarians sensitive to the strength of the Government’s mandate in the House – has begun to show it is willing to play a more muscular role of sober second thought than in the past, despite its appointed nature.

Reaching 172 would unquestionably improve Liberal fortunes. It would shift momentum, strengthen the government in confidence matters, and reduce immediate vulnerability.

But to state the obvious, a strong majority borne out of a clear electoral outcome would provide Carney with far greater stability and legitimacy, both within the House and with the public. Given the strong polling numbers the Liberal Party of Canada and Carney have enjoyed in recent weeks, seeking a stable majority mandate will be tempting for many in the Prime Minister’s orbit. And for good reason.

A decisive electoral victory would settle the committee question, blunt procedural obstruction, and reinforce the government’s authority in a way that mid-Parliament arithmetic simply cannot. It would confer not only numerical advantage, but democratic clarity. A weak majority assembled through floor crossings, by contrast, lacks that clarity.

A majority assembled through floor crossings may be enough for Carney to survive.

But a strong majority won at the ballot box would give him a mandate to govern with authority.

And in Parliament as with the public, that difference will come to matter.