Now ex-king Zahir Shah is the focus for calls for a new Loya Jirga.
But since any proposal has nonetheless to be approved by the loya jirga, there could be surprises.
No one would serve in both the interim government and the commission choosing the loya jirga, he added.
He said that he would call a loya jirga - a national gathering - to discuss the issue.
He has been attempting to convene a Loya Jirga - tribal council - for the re-establishment of order in Afghanistan.
For all its shortcomings, though, most Afghans still seem to consider the loya jirga as a step in the right direction.
Though all parties, including the Taleban, would be invited to the proposed Loya Jirga, it's extremely doubtful whether the Taleban leadership would attend.
Seven hundred people from both Afghanistan and Pakistan will participate in a big convention, or loya jirga, as we call it in Afghanistan.
The United Nations Assistance Mission in Afghanistan has voiced its concern about intimidation that it believes is designed to disrupt the loya jirga.
Given the past history of intense rivalries in Afghanistan, it is a big question, of course, whether even a Loya Jirga could find a consensus.
Mr Karzai has announced that a loya jirga, a traditional grand gathering of the country's power-brokers, will be convened to decide on the Americans' future.
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Each commission will consist of scholars, "neutral and benevolent people", two members of the commission for the convocation of the loya jirga, UN representatives and international observers.
Many Pushtuns were hoping that the loya jirga, the grand council that nominated a new government in June, would produce a rebalancing of the cabinet's ethnic composition.
Its influence may first be felt in the Loya Jirga, which may have to decide how much of Afghanistan's security and rehabilitation should be entrusted to outsiders.
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The council is supposed to convene a gathering of tribal leaders and other notables called a Loya Jirga, which in turn is to choose an interim government.
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Hamid Karzai, the president, said he would convene a loya jirga, a formal conclave of tribal elders, to discuss sensitive questions raised by America's plan to withdraw its forces by 2014.
But even if new laws are ratified by the mainly male constitutional Loya Jirga (grand assembly) that will consider the document, there is some doubt the measures will be enforced, correspondents say.
The interim administration would be in power for six months, or until a special commission could convene an initial, emergency loya jirga, or traditional Afghan council, U.N. spokesman Ahmad Fawzi told reporters on Sunday.
The Pushtuns are meant to be reassured both by the nomination of Mr Karzai and by the fact that the ex-king, Mohammed Zahir Shah, will open the loya jirga, or tribal assembly, which will take place in six months' time.
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