The Supreme Court will this morning hear the preliminary joinder motion filed by the NDC seeking to join the petition by the presidential candidate of the NPP, Nana Addo Dankwa Akufo-Addo; his running mate, Dr Mahamudu Bawumia, and the National Chairman of the NPP, Mr Jake Obetsebi-Lamptey, challenging the EC's declaration of President John Mahama as winner of the December 7 presidential poll as a respondent.