majb is discussing:

"Republicans expressed widespread fear that lowering the number of troops could allow the Taliban to continue to overthrow elements of the Afghan government.

“You can’t simply unilaterally draw down troops,” said Sen. Mike Rounds (R-S.D.), a member of the Armed Services Committee. “I think it’s a serious mistake to unilaterally walk away.”

Sure you can walk away! And there's even a simple solution to prevent them from gaining any power.