BJP leader Arjun Singh criticized party’s national vice president Mukul Roy for joining TMC without resigning from the party’s post and said that “opportunists in politics do this.” Arjun Singh said, “Opportunists in politics do this. There was a rift between Abhishek Banerjee and him...He then joined BJP...He'll keep coming and going. He won an election for the first time, that too on BJP symbol. He should have resigned before going.” Former BJP state national vice president Mukul Roy and his son Subhranshu Roy joined TMC in presence of West Bengal Chief Minister Mamata Banerjee in Kolkata on June 11.