Around 40,000 people are trapped in the refugee camp of Al Rukban, on the Syrian border with Jordan and inside the US-controlled area around the base of Al Tanf. The US is obstructing the rescue operation by refusing to protect the convoy that should take refugees out of the camp.
Since it is becoming impossible to continue affirming that US troops and the groups they support are impeding the exit of the refugees, the narrative has shifted to claims that the US is voluntarily frustrating the rescue operation by refusing to protect the convoy of the vehicles that were going to carry civilians out of the camp.
US State Department deputy spokesperson Robert Palladino said that Washington "fully supports a process that is free from coercion and allows for safe, voluntary, and dignified departures for those wishing to leave Rukban". A Syrian rebel commander for a US-backed group in the area declared that Russian military police and Syrian troops are the ones blocking humanitarian supplies from reaching Rukban in order "to get people to leave by force".
For the last two years, this Russian disinformation narrative has claimed that the US has been blocking the aid to Al Rukban camp, as you can see here and here, when it was actually the Syrian army who was responsible for the blockade.