Tenth Schedule Merger Debate: Twenty Trinamool MPs Claim Defection Immunity

Twenty rebel Lok Sabha MPs from the Trinamool Congress have announced their intention to merge with the Nationalist Citizens Party of India (NCPI), triggering significant legal and constitutional debate over the interpretation of India's Tenth Schedule anti-defection law. The MPs claim they constitute two-thirds of the Trinamool Congress legislature party in the Lok Sabha and therefore qualify for immunity from disqualification under merger provisions. However, legal experts and constitutional scholars question whether the Tenth Schedule permits two-thirds of a legislature party to merge with another political party, or only allows for a merger of an entire political party approved by two-thirds of its members.

The Tenth Schedule was introduced through the 52nd constitutional amendment in 1985 in response to widespread political defections during the 1960s and 1970s that destabilised state governments. Originally, the Schedule contained two exceptions to disqualification: one permitting one-third of legislature party members to split and form a separate group, and another allowing a political party merger approved by two-thirds of the legislature party. In 2003, the first exception was removed to strengthen the anti-defection law, leaving only the merger provision as a legal pathway for members to change party affiliation without facing disqualification.

The current case in West Bengal follows a pattern of increasingly aggressive interpretations of the merger clause. The Trinamool Congress Lok Sabha contingent, with 28 MPs before the recent elections, saw 20 MPs—representing approximately 71 percent—announce their merger decision. The Bombay High Court previously upheld a similar merger involving Congress MLAs in Goa with the BJP, though an appeal remains pending before the Supreme Court. In April 2026, seven of ten AAP Rajya Sabha MPs merged with the BJP using comparable reasoning. These precedents have created uncertainty about the Schedule's intended scope and the Speaker's discretionary authority in deciding disqualification cases.

Legal interpretation hinges on a critical distinction: whether the Tenth Schedule permits two-thirds of a legislature party within a single house to merge independently, or whether it requires the entire political party organisation to merge with prior approval from two-thirds of members. The plain text appears to authorise only the latter, yet recent instances suggest the former interpretation gaining practical ground. Additionally, unresolved questions remain about whether a merger can occur only between political parties already represented in the legislative house, and whether presiding officers exercise sufficient impartiality in deciding disqualification matters.

The Lok Sabha Speaker now faces the constitutional responsibility of determining whether the Trinamool MPs' merger claim meets the legal threshold for immunity from disqualification. The outcome will likely influence how the Tenth Schedule is applied in future cases and may necessitate judicial clarification or further constitutional amendment to address perceived loopholes in the anti-defection framework.