Special Envoy of the UN Secretary General, Rauf Engin Soysal called on President Asif Ali Zardari here at the Aiwan-e-Sadr on Friday. The President congratulated Ambassador Soysal on his appointment as Special Envoy for Assistance to Pakistan. The President assured the Governments full support and cooperation in discharge of his duties and hoped that his professionalism would create necessary synergies within the UN system to deal with the challenging situation.