A spokesman for the Taliban said the deadline of 31 August for the withdrawal of international troops from Afghanistan was a "red line" and that no extension would be allowed.
While U.S. President Joe Biden had promised the withdrawal of troops by the 31 August deadline, he has since said personnel may need to stay to continue the evacuation of all Americans from the country.
Taliban spokesman Suhail Shaheen, speaking in an interview with U.K. broadcaster Sky on Sunday, said "if they extended, that means they are extending occupation".
He added that any extension would create "mistrust" between the Taliban and the U.S.
Shaheen also denied that Afghans were attempting to flee the country due to fear of the Taliban, saying that those who wanted to leave the were doing so for "economic migration".
He claimed anyone saying they were "scared" of the Taliban had "exaggerated", in an attempt to get passage to Western nations.
Since the Taliban entered the city of Kabul there have been daily scenes of people flocking to the airport in an attempt to escape the country.
There have been deaths as a result of the crush from large crowds, stampedes and even people clinging to planes as they take off.
Shaheen also had little sympathy for families of soldiers from NATO countries who had died during the 20-year attempts to pacify the country, saying "they occupied our country."
While he said Afghanistan had seen "bloodshed," he claimed "the past is the past," adding that "we want to focus on the future."