A federal court blocked the Trump administration from flying three Venezuelan illegal immigrants in New Mexico to Guantanamo Bay Naval Base in Cuba, the first time a court has barred such transports.

Immigrant rights groups sent a letter demanding access to people who have been sent there, saying the base should not be used as a “legal black hole.”

The men, who are detained in New Mexico, say they “fit the profile” of the type of migrants the Trump administration has started sending to the Navy base in Cuba.