Former prime minister Dr Mahathir Mohamad and former transport minister Chan Kong Choy have denied receiving political funding from Ultra Kirana Sdn Bhd (UKSB).<br /><br />This followed claims by a witness in the corruption trial of former deputy prime minister Ahmad Zahid Hamidi.<br /><br />Mahathir told reporters in Langkawi yesterday that the accuser should show proof to back his claims.<br /><br />He gave an example of how the Pakatan Harapan administration showed the flow of money to Najib Abdul Razak's bank accounts.