"It's Either Abhishek Or Me': Key Aide's Ultimatum For Mamata Banerjee

For 15 years Mamata Banerjee and her Trinamool Congress were untouchable. Three consecutive Assembly election wins built her legacy and four straight Lok Sabha polls - in which the Trinamool was the single-largest party - cemented it.

But on Thursday the Trinamool lurched deeper into an existential crisis after party veteran Kalyan Banerjee ripped into her nephew and second-in-command, Abhishek Banerjee. "It is a great humiliation to me," Kalyan Banerjee - one of Mamata Banerjee's staunchest allies - fumed. "His arrogant attitude has destroyed the party... He should understand that."