Afghan President Hamid Karzai and Pakistani President Asif Zardari are both expected to attend the meeting.
It could also destabilise the central government of President Asif Zardari, another PPP-led coalition.
It was supposedly composed on the instructions of Mr Haqqani acting on behalf of President Asif Zardari.
ECONOMIST: Pakistan is forced to find a new ambassador to Washington
Mr Riaz has long been a controversial figure, known to be close to Pakistan's president, Asif Zardari.
Syed described the two leaders -- Sharif and Asif Zardari of the PPP -- as "like-minded" democratic forces.
Neither President Asif Zardari nor Yusuf Raza Gilani, the prime minister, deludes himself that he is really in charge.
The new government of Nawaz Sharif has been enthusiastically investigating her financial affairs and those of her husband, Asif Zardari.
For now, they have trained their anger on Pakistan's president, Asif Zardari.
Mr Holbrooke had earlier met Pakistan's political leadership, including President Asif Zardari, Prime Minister Yusuf Raza Gilani and Foreign Minister Shah Mehmood Qureshi.
While President Asif Zardari described this as a "miscommunication, " others blamed the government for failing to consult the military before making the unprecedented announcement.
Such claims are hardly new: Miss Bhutto's goverment was dismissed for alleged corruption, and her husband, Asif Zardari, is in jail accused of corruption.
President Asif Zardari was holding a meeting of leading figures in the ruling Pakistan People's Party (PPP) in Karachi, according to state broadcaster PTV.
It wants to turf Asif Zardari from the presidency and compel him to return the wealth that he has allegedly looted and stashed away in Switzerland.
Dr Farooq Sattar was speaking after President Asif Zardari said in an address to parliament that those destroying the peace in Karachi would be dealt with severely.
This seemed to come closer in November when Mr Musharraf released Ms Bhutto's husband, Asif Zardari, from prison, where he had languished for eight years without trial.
On April 15th she and her husband, Asif Zardari, were convicted in a Pakistani court of taking bribes from a Swiss company hired to stop customs fraud.
In a significant and symbolic development, Pakistan's President Asif Zardari has accepted NATO's offer to attend the Chicago summit, according to Pakistan's ambassador to the U.S., Sherry Rehman.
After showdown talks on August 6th and 7th Mr Sharif and the PPP's leader, Asif Zardari, reached a provisional agreement to impeach the president and restore the judges.
The question on everyone's lips is why he has launched this high-stakes battle with the judiciary and whether he has been encouraged to do so by Mr Asif Zardari or the army's top brass.
If so, her hopes would be based on a Supreme Court verdict on April 6th which set aside a conviction by a lower court in Lahore for corruption against her and her husband, Asif Zardari, and ordered a retrial.
In June 2011, Ms Bhutto's husband and by then the president of Pakistan, Asif Zardari, was stopped from visiting his ailing father in an Islamabad hospital after the intelligence agencies uncovered what they claimed to be an assassination plot involving several Taliban suicide bombers.
As he tried to rebuild the country, the new President Asif Zardari was reluctant to listen to American advice, insisting, for example, on a land-for-peace truce with Taliban militants in the Swat valley (see Pakistan's Mistaken Strategy) that lasted a matter of weeks.
Pakistani President Asif Ali Zardari strongly condemned the murder, describing it as a "tragic incident".
Pakistan's Prime Minister Raja Pervez Ashraf and President Asif Ali Zardari both immediately condemned the attack.
Bhutto's husband, Asif Ali Zardari, wants a United Nations inquiry into his late wife's assassination.
In Pakistan Saturday President Asif Ali Zardari also welcomed Obama's plan to pump economic aid into Pakistan.
Mr Gilani is accused of failing to reopen a corruption investigation against the president, Asif Ali Zardari.
Bhutto's husband, and now president, Asif Ali Zardari, took them horseback riding in the surrounding Murree Hills.
Without a deal, officials said Obama would not meet with President Asif Ali Zardari at the summit.
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