India, June 11 -- Mamata Banerjee's Trinamool Congress (TMC) remains caught in what is being seen as its biggest internal crisis yet, as resignations and dissent continue to grow, a month after the party was voted out of power in West Bengal, which it had governed for 15 years straight. Rajya Sabha MP Prakash Chik Baraik became the latest TMC leader to resign from his post in the Upper House of Parliament on Thursday.

While the party faces a wave of resignations, rebel TMC MP Kakoli Ghosh Dastidar alleged that nearly 20 party MPs had written to Lok Sabha speaker Om Birla to convey their support for the BJP-led NDA.

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The troubles are not limited to the Lok Sabha. In the West Bengal assembly...