“The Trump administration in February 2020 negotiated a withdrawal agreement with the Taliban that excluded the Afghan government, freed 5,000 imprisoned Taliban soldiers and set a date certain of May 1, 2021, for the final withdrawal.”
Trump made the agreement and set the date.
Biden issued the actual orders.
“Biden delayed the May 1 withdrawal date that he inherited. But ultimately his administration pushed ahead with a plan to withdraw by Aug. 31, despite obvious signs that the Taliban wasn’t complying with the agreement and had a stated goal to create an “Islamic government” in Afghanistan after the U.S. left, even if it meant it had to “continue our war to achieve our goal.””