Washington-Top U.S. officials at Guantanamo Bay, Cuba have expected the release of Mohamedou Ould Slahi, 45, one of the most controversial prisoners at the facility and the author of a best-selling memoir about his time there.

“I am just thrilled that he is finally cleared again and the government of Mauritania has said it welcomes him home,” said Nancy Hollander, one of Slahi’s attorneys.

“His book, “Guantanamo Diary,’’ which was published last year, is thought to be the only existing memoir written by a current detainee,” said The Washington Post.

The prison has 76 detainees, and 31 of them have been approved for transfer, it said.

According to The Washington Post, several members of the Republican Party at the convention that is held in Cleveland in the State of Ohio have expressed anger at President Barack Obama, accusing him of being tolerant with terrorists.

Several party officials said Obama was responsible for the release of prisoners from Guantanamo and their return to Afghanistan to fight U.S. troops there.

They also criticized the U.S. president for not providing details on the fate of each detainee released from Guantanamo.

New Hampshire Sen. Kelly Ayotte said there seems to be extensive and coordinated efforts by the Obama administration to stop the American people from knowing the truth about what happens to prisoners that have been released from Guantanamo.

Another Republican, Ed Royce from California, asked the administration for more transparency in following up the activities of former Guantanamo detainees.

He said the authorities were releasing dangerous prisoners and sending them to countries where they have no longer control over.

The administration is also rejecting to provide the Congress with enough information on the issue, Royce added.