The All India Trinamool Congress (TMC), led by party supremo Mamata Banerjee, is facing the deepest internal crisis of its 28-year history. Following a crushing defeat in the April 2026 West Bengal Assembly elections—which brought an end to the party’s 15-year governance in the state and saw the BJP rise to power—the party’s federal parliamentary presence is now fractured.
A high-stakes rebellion has officially spilled into New Delhi. A formal letter, dated May 18, 2026, was submitted to Lok Sabha Speaker Om Birla’s office by a breakaway group of 19 rebel TMC Lok Sabha Members of Parliament (MPs). The faction is seeking recognition as a separate parliamentary group, declaring themselves the “real” Trinamool Congress and staking a claim to the party’s official election symbol before the Election Commission.
The Mathematics Behind the Breakaway
The TMC went into this session as the third-largest opposition block in the Lok Sabha with 28 members, trailing only the Indian National Congress and the Samajwadi Party. By rallying 19 signatories, the rebel faction comprises exactly two-thirds of the party’s total lower-house strength. This fraction is highly strategic; under India’s anti-defection law (the Tenth Schedule of the Constitution), a minimum of two-thirds of a legislative party must break away to bypass immediate disqualification as members of Parliament.
Led by senior leader Kakoli Ghosh Dastidar, the list of 19 dissident MPs features several high-profile names, including former international cricketer Yusuf Pathan and prominent youth leader Saayoni Ghosh.
The Full List of 19 Rebel Lok Sabha MPs:
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Kakoli Ghosh Dastidar (Faction Leader)
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Satabdi Roy
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Bapi Haldar
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Dr. Sharmila Sarkar
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Prasun Bandyopadhyay (referred to in local listings as Prasun/Sharmila)
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Jagadish Barma Basunia
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Asit Kumar Mal
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Arup Chakraborty
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Rachna Banerjee
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Saayoni Ghosh
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Khalilur Rahaman
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Abu Taher Khan
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Yusuf Pathan
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Mitali Bag
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Mala Roy
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Kalipada Soren
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Deepak Adhikari (popularly known as Dev)
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June Malia
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Partha Bhowmick
Technicalities and Political Stance
The rebel faction has explicitly stated that they do not intend to join the BJP or the ruling National Democratic Alliance (NDA). Instead, they plan to operate as an independent faction in Parliament, focused entirely on what they describe as “protecting the interests of West Bengal.”
A critical procedural hurdle rests on the exact timing of the rebellion. The submitted letter is dated May 18. This is precisely one day before Mamata Banerjee’s loyalist wing appointed senior MP Kalyan Banerjee as the party’s Chief Whip in the Lok Sabha on May 19. The Speaker’s office will now have to analyze these dates to determine the legality and procedural validity of the split.
Broader Consequences for the TMC
The rebellion is not restricted to the Lok Sabha. The crisis has triggered a massive domino effect across the party’s entire structure:
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The Legislative Assembly: The parliamentary split follows an unprecedented revolt in the West Bengal State Assembly, where expelled MLA Ritabrata Banerjee claimed that 58 out of 80 TMC MLAs have already shifted to break away from the main party fold.
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The Rajya Sabha: The party’s upper house presence is also disintegrating, with three Rajya Sabha MPs resigning from both the house and the party in quick succession.
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The Core Loyalists: Only 9 Lok Sabha MPs remain fully outside the rebel camp. High-profile figures like Abhishek Banerjee, Mahua Moitra, Kalyan Banerjee, Sougata Ray, and Shatrughan Sinha have explicitly rejected the split, with Sinha publicly reaffirming his absolute loyalty to Mamata Banerjee.
Insiders attribute the internal explosion to widespread frustration over the party’s recent assembly election losses, coupled with growing resentment regarding the central management style of National General Secretary Abhishek Banerjee. With a prolonged legal battle looming over the party name and symbol at the Election Commission, the future of the TMC hangs entirely in the balance.
