That seems like the least disgraceful part of the whole thing.

Wherever they go, the U.S. taxpayers are stuck footing the bill for their prison stay, food, medical treatment, etc., but why would it need to be in the United States? They have no claim to stay there.

The disgraceful part is sending illegal immigrants without criminal history to maximum-security prisons, sending asylum seekers to prison, or sending anybody to prisons that torture the inmates.