WASHINGTON (AP) — The Supreme Court won’t hear an appeal from a former government subcontractor seeking to sue the U.S. government for negligence over his five-year imprisonment in Cuba.

The justices on Monday let stand a federal appeals court ruling that threw out Alan Gross’ $60 million lawsuit blaming the federal government for failing to prepare him for the risks of working in Cuba.

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Gross was freed in December as the U.S. announced it would re-establish diplomatic relations with Cuba. He was working as a U.S. Agency for International Development subcontractor in Cuba when he was arrested in 2009.

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The U.S. Court of Appeals for the District of Columbia Circuit ruled last year that the U.S. government is immune from claims arising in a foreign country.

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