Four years after dumping Trinamool Congress (TMC), Bharatiya Janata Party's (BJP) national vice president Mukul Roy is back in Mamata Banerjee's fold. He was welcomed by Bengal Chief Minister Mamata Banerjee and other party leaders in Kolkata.On being asked why he left BJP, Roy said, "I will issue a statement about why I left BJP, but I could not and cannot be in BJP, hence I came back. In the present circumstances in Bengal, no one will stay in BJP."So, will more BJP chips fall in Bengal? Watch as panellists debate.