Bagram, the largest air base in Afghanistan located north of the capital Kabul, was the centre of US operations in their 20 year-war against the Taliban.
Trump threatened unspecified punishment against Afghanistan if it was not returned -- four years after it was abandoned by US troops.
"If Afghanistan doesn't give Bagram Airbase back to those that built it, the United States of America, BAD THINGS ARE GOING TO HAPPEN!!!" the 79-year-old leader wrote on his Truth Social platform.
On Sunday, Fasihuddin Fitrat, chief of staff of Afghanistan's ministry of defence, said "some people" want to take back the base through a "political deal".
"Recently, some people have said that they have entered negotiations with Afghanistan for taking back Bagram air base," he said in comments broadcast by l