The new case, which for now is asking for a court to block the transfer of 10 men to the offshore base, is the first to directly challenge the policy.

The lawsuit says there is no legitimate reason to send migrants to Guantánamo because the U.S. has ample detention facility.

Civil rights attorneys are suing the Trump administration to prevent it from transferring 10 migrants detained in the U.S. to Guantanamo Bay, Cuba

Immigrant rights groups sued the Trump administration on Saturday in hopes of stopping the transfer of migrants from the U.S. to Guantanamo Bay.

Civil rights attorneys sued the Trump administration Saturday to prevent it from transferring 10 migrants detained in the U.S. to Guantanamo Bay, Cuba, and filed statements from men held there who said they were mistreated there in conditions that of one of them called ''a living hell.