West Bengal's former Chief Minister Mamata Banerjee stood before opposition INDIA bloc partners in New Delhi on Monday, 9 June, urging unity and coordination — even as, less than two kilometres away, most of her own Trinamool Congress (TMC) MPs were reportedly negotiating an alliance with the ruling National Democratic Alliance (NDA). The optics encapsulated the central contradiction of her political career: projecting coalition solidarity while her own house fractured in real time.

The Scale of the Rebellion

The defection crisis unfolding within the Trinamool is the gravest of Banerjee's career. As many as 20 of her 28 Lok Sabha MPs are said to have broken away, putting her twin-floret election symbol at risk. Earlier, 58 of the party's 80 MLAs in the West Bengal Assembly had already done the same in Kolkata. Together, the numbers point to a near-collapse of the organisational structure she spent 28 years building since founding the Trinamool in 1998.

A Career Defined by Strategic Pivots

Banerjee's political biography is a study in calculated reinvention. She rose through the Indian National Congress (Congress), her fiery early identity captured famously in an image of her climbing Jayaprakash Narayan's car in protest ahead of the 1977 election. She flourished under Rajiv Gandhi's patronage and later maintained a working relationship with Sonia Gandhi, though she reportedly never warmed to Rahul Gandhi, at times dismissing his leadership as politically immature.

After founding the Trinamool, she aligned with the Bharatiya Janata Party (BJP)-led NDA and served as Railway Minister, only to formally exit the coalition in 2001, citing corruption and governance failures. She briefly returned in 2004, contesting Lok Sabha elections in alliance with the BJP — but her party won only one of eight seats it contested, and she severed ties again. That episode, observers note, set the template for her politics: align when strategically useful, break away when the association becomes a liability in West Bengal.

She then aligned with the Congress-led United Progressive Alliance (UPA) between 2009 and 2012, using the partnership to form her government in 2011. Once comfortably in power, she again chose an independent course.

The INDIA Bloc Paradox

Despite her high-profile presence since the opposition bloc's founding in Patna in 2023, Banerjee's engagement with the INDIA alliance has been marked by contradictions. Critics argue she either rejected seat-sharing in West Bengal outright or offered terms that rendered any alliance unworkable. Her alliance overtures, according to observers, are increasingly read by partners as bids to shore up her own position rather than build a genuinely symbiotic coalition.

Of the bloc's constituent leaders, only Samajwadi Party (SP) chief Akhilesh Yadav and former Aam Aadmi Party (AAP) supremo Arvind Kejriwal are said to still share a rapport with her — and the AAP has since exited the opposition bloc entirely.

The 2026 Bengal Rout and What Comes Next

The 2026 West Bengal Assembly election delivered a decisive blow: the BJP swept the state, and Banerjee herself lost her home bastion of Bhabanipur. The defeat ended a 28-year run at the helm of the Trinamool and stripped her of the institutional power that had long insulated her from internal dissent.

Those who have studied her career closely describe her as an unpredictable, impulsive, and emotionally driven leader — one who, according to reports, kept herself surrounded by advisers inclined to offer affirmation rather than candid counsel, occasionally distorting her political judgement. Whether that pattern can be broken as she enters her seventies — and whether the Trinamool can be rebuilt from the ruins of its current crisis — will define the final chapter of one of Indian politics' most turbulent careers.