<p>Defending Mamata Banerjee-led TMC government in West Bengal, Sougata Roy said that the term 'post-poll violence' used by the "Bharatiya Janata Party is just a "political case" through which "BJP is trying to save face after defeat."</p>.<p>"Post-poll violence did not happen after Chief Minister Mamata Banerjee took charge again... CBI is doing its work, let it, but I don't think it'll not prove anything. It was a political case, BJP tried to save itself after its defeat, NHRC team was also political," said Roy.<br /> </p>