The 169 Americans had met up intending to walk through the gate, until the security situation changed.
Biden signaled he is open to allowing troops into Kabul to rescue Americans.
More than 7,000 people have gotten out of Kabul since Saturday.
The evacuation mission remains constrained to the Kabul airport.
Flights are expected to resume within hours.
It's not a combat deployment, but there will likely be imminent danger pay.
Three thousand are heading to Kabul, with another 3,500 in Kuwait and 1,000 to Qatar.
By Meghann Myers and Robert Burns, The Associated Press While 750 Afghans are going straight to Virginia, thousands more will go to a way station out of Afghanistan.
Defense and veterans hearings on Capitol Hill for the week of May 17, 2021.
The drawdown is anywhere between 6 and 12 percent complete, but details on how many people are still there have been withheld.
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