Pakistan's ambassador to the US, Husain Haqqani, is flying into Islamabad to answer allegations that he wrote a memo that asked for US help against the Pakistani army on behalf of President Asif Ali Zardari.
Haqqani, a close aide of Zardari, has played an important role in helping Pakistan's civilian government navigate turbulent relations with the US, which deteriorated after the raid that killed Osama bin Laden in Pakistan in May.
Al Jazeera's Kamal Hyder explains the ramifications on Pakistan
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