WASHINGTON - Pakistan' outgoing ambassador to the U.S. Mahmud Ali Durrani said Thursday he will play the role of a coordinator on national defence, including foreign policy and internal security, in his new capacity as Adviser to Prime Minister Syed Yousef Raza Gilani. "I will not step on somebody's toes and I will just play the role of a coordinator. All departments will continue to work as they are working now," Maj.Gen. (Rtd) Durrani told Pakistani journalists as he winds up his affairs in Washington. He will leave for Islamabad next week to take up his new assignment in the P.M. secretariat where he will have a small office. Ambassador said as spelled out by the top political leadership, the national security adviser would liaise with the army, the US and be a bridge between the executive and the presidency. In response to a question, Durrani said he would continue to have some association with the country's anti-terror efforts.  Ambassador Durrani has been making farewell calls at the White House and the State Department as also on Capital Hill. These calls included Secretary of State Condoleezza Rice. MEETS BUSH On Thursday, the ambassador also had a brief meeting with President George W. Bush during a farewell call on National Security Adviser Stephen Hadley at the White House. "President Bush dropped in for a short time during the meeting with my counterpart Stephen Hadley," Durrani stated. The US president was appreciative of the ambassador's efforts toward improving US-Pakistan relations during his ambassadorial term and wished him well in his new assignment. The envoy has also met with senators John Kerry and Chuck Hagel. Ambassador-at-Large Husain Haqqani, a well-known figure in Washington, would replace Durrani as Pakistan's envoy here. Ambassador Durrani complimented former Foreign Secretary Riaz Muhammad Khan and the Ministry of Foreign Affairs for the cooperation extended to him in the fulfillment of his responsibilities in last two years.  Asked to sum up his achievements in the two-year diplomatic term, Durrani told newsmen at the Pakistani embassy he endeavored to strengthen relations and foster a better understanding between the two nations. "Particularly with regard to the war on terror, I argued to the best of my ability to improve perceptions, highlighting Pakistan's key anti-terror role --- I think I was able to achieve some success in putting across our point of view," he said referring to efforts to address Afghan border situation. Secondly, he said, the level of US funding remained steady and there was no decline in it. However, he said, it is up to the posterity to judge his performance during the challenging assignment.