• ACLU lawsuit claims transfers violate U.S. immigration law
• Migrants face harsh conditions, including isolation and abuse
• Allegations that conditions led to suicide attempts

WASHINGTON, March 1 (Reuters) - A U.S. civil rights group on Saturday sued to block the Trump administration from potentially transferring 10 migrants from the U.S. to a naval base in Guantanamo Bay, Cuba, detailing harsh conditions and suicide attempts among migrants held there.

The American Civil Liberties Union, which filed the lawsuit in federal court in Washington, D.C., said the transfers violate U.S. immigration law by moving the detainees outside of the country and aim to stoke fear without a legitimate rationale.

The 10 detainees in the lawsuit are men from Venezuela, Bangladesh, Pakistan and Afghanistan with final deportation orders, including some who have been threatened with transfer to Guantanamo, ACLU said. The men, currently held in Texas, Arizona and Virginia, are not gang members or high-risk criminals, the ACLU said.