Text of a Letter from the President to the Speaker of the House of Representatives and the President Pro Tempore of the Senate
Cuba. United States Armed Forces continue to conduct humane and secure detention operations for detainees held at Guantánamo Bay, Cuba, under the authority provided by the 2001 Authorization for the Use of Military Force (Public Law 107-40), as informed by the law of war. There are 40 such detainees as of the date of this report.
https://www.whitehouse.gov/briefings-statements/text-letter-president-speaker-house-representatives-president-pro-tempore-senate-5/