ISLAMABAD - Two ambassadors-designate and a high commissioner of Pakistan Saturday called on President Asif Ali Zardari at Aiwan-e-Sadr and exchanged views over issues relating to their new assignments. According to official sources, Khalid Aziz Babar, Pakistans Ambassador-designate to Iran, Amjad Sial, Ambassador-designate to Tajikistan and Hasan Javed, high commissioner-designate to Singapore called on President Asif Ali Zardari at Aiwan-e-Sadr.