Biden-administration's move will make it difficult for Kabul to receive defence equipment from Washington.
Many refuse to recognise their own country, but they also lament a lack of funding from Kabul's new authorities.
Ashraf Ghani defended his decision to flee the war-torn country and also denied widespread accusations that he carried with him millions in stolen money.
Ex-Afghan leader Hamid Karzai says he invited the Taliban insurgents into the capital Kabul on August 15 so that "the city doesn't fall into chaos," following a covert departure of Ashraf Ghani and his team from the country.
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.
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