Pakistan has ordered all unauthorised Afghan asylum seekers - an estimated 1.7 million people - to leave the country by November.
A spike in attacks along the two countries' border, which Islamabad blames on Afghanistan-based operatives, has escalated tensions this year.
It has also fuelled resentment in Islamabad, which on Tuesday announced a crackdown on "illegal" migrants.
The Taliban government urged Pakistan to rethink its "unacceptable" move. Afghanistan's rulers have repeatedly denied providing refuge for militants who target Pakistan.
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