Trinamool Congress (TMC) leader Babul Supriyo said on Monday that he rejoined politics because party supremo and West Bengal CM Mamata Banerjee asked him to work for the state. Supriyo's remark came after the TMC declared him as its candidate in the Assembly by-election from Ballygunge seat. Supriyo had resigned as Union Minister and BJP's MP from Asansol in 2021.