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The White House is again defending the withdrawal of remaining U.S. troops from Afghanistan.
National Security Adviser Jake Sullivan says there were no good options for a final withdrawal.
He added the events of the past month have "proven decisively" that a significant American troop presence would have been needed to stop a Taliban onslaught.
He acknowledged the chaos and praised the U.S. military for making necessary adjustments to secure the airport in Kabul for evacuations.