Chennai, April 18: Senior Congress leader P. Chidambaram on Wednesday asked the BJP to make its stand clear on the statement of its Tamil Nadu leader H. Raja, calling DMK MP Kanimozhi an illegitimate child of party chief M. Karunanidhi. “There is no such thing as an ‘illegitimate child’. All children are perfectly legitimate. Will the BJP please explain where it stands?” Chidambaram tweeted.