Abdullah Hussain Haroon has been appointed as Pakistani Ambassador to the United Nations replaced Munir Akram.
Akram's contract was prematurely terminated following strong differences between him and Pakistan President-elect Asif Ali Zardari over asking the United Nations to appoint an independent commission to hold an inquiry into the assassination of PPP leader Benazir Bhutto.
The former Pakistan Prime Minister was killed after addressing an election meeting in December last year.
The change was made ahead of an expected visit by Zardari to the United Nations to address the 192-member General Assembly on September 25.
Prime Minister Manmohan Singh is slated to set out New Delhi's agenda for the annual session and beyond on September 26.
Akram along with some senior Pakistani Foreign Ministry officials was against involving the world body as they felt it would compromise the country's sovereignty and force the government to open some confidential files to the investigators, sources said.
Akram was a career diplomat but Haroon is a politician having held, among other, the post of speaker of the provincial Sind Assembly. Haroon is also a close friend of Zardari.