That was a big part of the fiasco; he left them there too long-- mistakenly believing he had more time than he had to get everyone out safely.Trumps agreement with the Taliban was to withdraw troops by May, 2021. Biden actually left them there longer.
What happens next? No one really knows. Thousands of Americans now are at the mercy of the taliban.
Hopefully the taliban will allow them all to leave without harming them.
Seemingly biden had no plan other than to refuse to go along with Trump's deal with the taliban.
This catastrophe lies solely on biden's shoulders...he went against the advise he was given.