Trinamool rebellion revives government hopes of passing Delimitation Bill

The Constitution (131st Amendment) Bill, 2026 — which seeks to expand the Lok Sabha from 543 to 850 seats and enable delimitation based on the 2011 Census — ...

What Happened

The Constitution (131st Amendment) Bill, 2026 — which seeks to expand the Lok Sabha from 543 to 850 seats and enable delimitation based on the 2011 Census — was voted down in Lok Sabha on April 17, 2026, falling short of the required two-thirds special majority.
The bill secured 298 votes against 230, but with 528 members participating, the government needed 352 votes — a shortfall of 54.
Growing factionalism within the Trinamool Congress (TMC) has now shifted the arithmetic: around 20 TMC MPs broke ranks, formed a separate group, and signalled support for the NDA, reviving the government's prospects of passing the bill.
The rebel TMC MPs met with a senior Union Minister to formalise their decision, and the group has submitted a letter to the Lok Sabha Speaker seeking recognition of their faction.
The government is expected to reintroduce the bill during the Monsoon Session, scheduled to begin in the third week of July 2026.

Static Topic Bridges

Article 368 — Special Majority for Constitutional Amendments

Article 368 of the Constitution prescribes the procedure for amending the Constitution. Most substantive amendments require a "special majority": a majority of the total membership of each House AND not less than two-thirds of members present and voting in that House. Some amendments that affect federal features additionally require ratification by at least half the State Legislatures.

Special majority = majority of total House strength + two-thirds of members present and voting.
The Constitution (131st Amendment) Bill requires this special majority in both Houses separately.
Ordinary legislation passes by a simple majority (more than 50% of members present and voting); constitutional amendments have a higher threshold precisely to protect constitutional fundamentals from transient majorities.

Connection to this news: The bill was defeated because the government secured only 298 of the 352 votes needed — a textbook illustration of how the two-thirds threshold acts as a structural check on constitutional change.

Article 82 — Readjustment after Each Census

Article 82 mandates that, after the completion of each national census, Parliament shall enact a law providing for: (a) readjustment of the allocation of Lok Sabha seats among States, and (b) redrawing of territorial constituency boundaries within each State. These changes take effect only on the dissolution of the existing Lok Sabha.

Seat allocation has been frozen since the 1971 census under the 42nd Constitutional Amendment (1976), extended by the 84th Constitutional Amendment (2001) until publication of census figures after 2026.
Article 81(3) explicitly sustains the freeze "until the relevant figures for the first census taken after the year 2026 have been published."
The 2026 delimitation package proposes to break the freeze by using the 2011 Census as the basis for seat expansion, even before the pending census (due February 2027) is complete.

Connection to this news: The Constitution (131st Amendment) Bill is the enabling amendment to override the existing freeze and conduct delimitation using 2011 Census data, making it the constitutional prerequisite for any seat expansion.

The Delimitation Freeze — 42nd and 84th Amendments

The total number of Lok Sabha seats per State has been frozen at the 1971 census level through successive constitutional amendments to incentivise population control. The 42nd Amendment (1976) imposed the original freeze. The 84th Amendment (2001) extended it to after 2026. The 91st Amendment (2003) made associated adjustments to the anti-defection law.

Freeze rationale: States that controlled population should not be penalised by losing parliamentary seats.
Impact of unfreeze: Southern states (Tamil Nadu, Kerala, Karnataka, Andhra Pradesh, Telangana) fear losing seats — Tamil Nadu alone is projected to drop from 39 to 31 seats — while high-population northern states gain. UP, Bihar, Madhya Pradesh and Rajasthan together stand to gain about 22 seats.
The proposed expansion to 850 seats attempts to mitigate this by adding net new seats to all States, rather than redistributing existing ones.

Connection to this news: The political opposition to the bill is driven substantially by southern States' apprehension about representation loss — the core reason the government now needs to build broad coalition support, including from TMC and DMK.

Anti-Defection Law and the Tenth Schedule

The Tenth Schedule of the Constitution (inserted by the 52nd Amendment, 1985) disqualifies a Member of Parliament from membership of the House if they voluntarily give up the membership of their political party or vote/abstain contrary to party direction without prior permission.

Disqualification is decided by the Speaker of the respective House.
Exception: A faction of at least two-thirds of the party's legislators can merge with another party without attracting disqualification.
A faction claiming recognition as a separate group does not automatically escape the Tenth Schedule — the Speaker must assess whether it constitutes a valid "merger" or "split."

Connection to this news: The TMC rebel faction's bid to get recognised as a separate group by the Lok Sabha Speaker is legally significant: its political viability — and therefore the government's floor numbers — depends on how the Speaker rules on disqualification petitions, if any are filed.

Key Facts & Data

Lok Sabha vote on April 17, 2026: 298 for, 230 against (528 total); required 352 (two-thirds of 528).
Proposed expansion: Lok Sabha from 543 seats to approximately 850 seats.
Delimitation basis proposed: 2011 Census.
Southern States' projected seat change: from 129 to approximately 103 seats if based purely on population proportionality.
Tamil Nadu projected change: 39 seats → 31 seats.
Population census next scheduled: enumeration from February 2027; figures expected late 2027.
Monsoon Session expected: third week of July 2026.
TMC rebel group: approximately 20 MPs; letter submitted to Lok Sabha Speaker seeking recognition.