The National Democratic Congress (NDC) has filed a supplementary affidavit to its motion to join a petition by Nana Addo Dankwa Akufo-Addo, the presidential candidate of the New Patriotic Party (NPP), Dr. Mahamudu Bawumia, his running mate, and Mr Jake Obetsebi-Lamptey, the National Chairman of the NPP, challenging the declaration of President John Dramani Mahama as winner of the December 2012 presidential election.