Hussain Haqqani, a close aide of President Asif Ali Zardari, has played a key role in helping Pakistan's civilian government navigate turbulent relations with Washington that nosedived over the US raid that killed Osama bin Laden.
Local media reports implicated Haqqani in a memo allegedly sent from Zardari to Admiral Mike Mullen, then America's top military officer, seeking to curtail Pakistan's military shortly after it was humiliated by the bin Laden killing.
Zardari reportedly feared that the military might seize power in a bid to limit the hugely damaging fallout in Pakistan after Navy SEALs killed bin Laden in the garrison city of Abbottabad on May 2.
The alleged memo, released last month by American businessman Mansoor Ijaz, said that a "new national security team" in Pakistan -- with US support -- could end ties between Pakistani intelligence and militants.
A senior government official told AFP that Haqqani "arrived early Sunday and is due to attend several meetings including a meeting with the President to explain the situation".
Haqqani has offered to resign over the row, but has denied any involvement with the document.
Pakistan's opposition leader Nawaz Sharif on Saturday demanded an independent commission to investigate the issue.
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