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The sale comes as Israel intensifies its offensive in the Gaza Strip. The US has pressed Israel to minimize civilian casualties in Gaza and has called to scale down the war in the coming weeks.
Such an evacuation could be "more difficult than any previous operations in recent memory," the Post reported, potentially involving Air Force aircraft or Navy warships.
The agency has been releasing increasingly serious travel advisories since war broke out in Israel, and is now urging all US citizens to leave Lebanon ASAP, raising questions of what's to come.
Biden spoke about the humanitarian assistance to Gaza on his way back to Washington from Israel early Thursday morning.
Members of the Islamic Jihad and PFLP have taken part in events held by a recipient of US State Department grants.
The staffer, who works for Senator Eric Schmitt, shared the details of the briefing on condition that he not be identified by name.