In an official statement, former President APJ Abdul Kalam has today told the Bharatiya Janata Party that his conscience doesn't allow him to contest for the post of President, a decision that is most likely to send the BJP and Trinamool chief Mamata Banerjee in a fray. Despite BJP leader Lal Krishna Advani trying to persuade him to contest for the presidential polls, Kalam had indicated his unwillingness to contest for the esteemed post.