At Least Five Of The Children Who Were Taken From Their Parents At The Border Were Sent To ICE Detention When They Turned 18

"In the most extreme cases, this means that ICE field officers refuse to release age-outs to organizational sponsors who have said they would be happy to take them in or to eighteen-year-olds' own parents living in the United States."

https://www.buzzfeednews.com/article/adolfoflores/family-separations-teens-age-out-ice