A banter between senior Congress leader Priyanka Gandhi Vadra and Trinamool Congress MP Kalyan Banerjee in the Parliament complex on Thursday captured how political necessities have led to breakaways and reunions. Banerjee, MP from West Bengal’s Sreerampur and one of the eight Trinamool Lok Sabha members still backing party chief Mamata Banerjee, was staging a protest at Parliament with a poster worn around his neck. Banerjee replied that some Congress leaders switched to the Trinamool Congress in 2014 because the Grand Old Party had little presence in Bengal. I was a vice-president of the Youth Congress,” Banerjee shot back. “When Didi said this, she was driven out of the party (Congress),” the Trinamool MP said.