The detainees were being forced to sign a paper
http://www.dallasobserver.com/news/they-were-told-they-would-have-to-go-back-immigration-order-sparks-chaos-protests-at-dfw-international-9132755
(snip)
At first, he had phone contact with his father. Soon after being taken into the "small room," he says, his father was told to hang up. The last text he received from his father came at 4:55 pm, and at midnight, there was still no resolution, despite a federal judge's ruling Saturday evening for a stay of Trump's ban.
"[My father] says he was being forced to sign a piece of paper, but he refused to sign and put the pen down on the table in front of him," Osama AlOlabi ays. "He was told that refusing to sign would mean going to jail, but he refuses. I don't know what's happened to my parents after that."
(snip)
Ahluwalia and other lawyers gathered among the protesters at the international arrival hall in DFW International's Terminal D were not allowed access to those who were detained. Arriving passengers are not technically on American "soil" until they pass through customs, and thus do not have rights to legal counsel while detained.
She said the form Ahmed AlOlabi was being told to sign was probably an "expedited order of removal," a "withdrawal of his request to be admitted" or an "acknowledgement of inadmissibility."
Legally speaking, signing such a document would then allow CBP to deport Ahmed and Basimal, despite Judge Donnelly's and other judges' rulings being in place.
(end snip)
To quote Madonna, FUCK YOU.