The Taliban’s challenge is to root out Daesh's Khorasan wing without sowing the seeds of another long war.
Meanwhile, the US special inspector general for Afghanistan reconstruction, said his office will probe allegations that former Afghan President Ghani took millions of dollars with him when he left the country.
Taliban has deposited $12.3 million seized from homes of officials of the ousted government, says the central bank.
Questions surround Khalilzad, an enigmatic diplomat who presided over US failures in Iraq and now the return of the Taliban to power in Afghanistan.
The US president said that some soldiers could remain past the August 31 deadline to ensure all Americans get out.
The United Arab Emirates says it has accepted Ashraf Ghani and his family on “humanitarian" grounds.
People in Afghanistan, ranging from journalists to those who worked with western troops and NGOs over the past two decades, are seeking to delete their online history in fear of Taliban retribution.
The Taliban regime may last longer than before, as it controls more territory and could see global recognition. But holding onto power would require it to make a break with its past.
Many Afghans are worried about their country’s future under a return to Taliban leadership.
The current regional balance of power, in which Russia and China see the Taliban as the lesser of two evils, and a hasty US withdrawal helped the group march across Afghanistan, experts say.
Kabul's streets were deserted on Monday, a day after Taliban insurgents took over the Afghanistan capital without a fight, but the airport was jammed with hundreds of civilians trying to flee.
President Joe Biden has doubled down on his decision to withdraw US forces from Afghanistan despite the Taliban's rapid advances, but pledged to send more troops to evacuate civilians and warned the militants not to threaten that mission.
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