Darby is the first detainee to leave Guantanamo prison for more than a year since President Donald Trump took office. [Hui Sha The Pentagon spokesman Sarah Higgins said the US and Darby reached a plea agreement in 2014, allowing him to return to Saudi Arabia to complete the remaining 13 years of prison sentence. The United States is coordinating with the Saudi government to ensure that handover is done in accordance with existing standards and humane treatment. The Associated Press reported that Darby may serve a remaining sentence in Saudi Arabia for some 9 years under a renovation project. He was supposed to return to Saudi Arabia before February 20th this year. Darby, 43, was arrested in Heydar Aliyev Airport in Azerbaijan in 2002 and was taken to the US military base in Bagram, Afghanistan. He once said in a testimony that he was arrested separately, hung on the door in shackles, and was subjected to various forms of harsh interrogation, such as deprivation of sleep. The United States accuses Darby of plotting and attacking civilian targets and assisting the base organization to attack the French fort Lin tanker in 2002. He pleaded guilty to the Guantanamo base Military Commission in 2014. As the chief prosecutor of the Guantanamo base war crime lawsuit, general Mark Martins said in a memo of the Ministry of defense in February that Darbys testimony on the details of Al Qaedas actions was inestimable to the US side. [continue to use Darby moved out of Guantanamo prison, meaning that there were 40 remaining detainees there. Barack Obama, former Democratic president, transferred the detainees to other countries several times after he took office in 2009, reducing the total number of the latter from 242 to 41. Only 8 years after he left office, he failed to fulfill his promise to close the Guantanamo prison. Unlike Obama, Trump wants to continue using the Guantanamo prison. When he ran for president, he said he had to put some bad guys in. In January, Trump signed orders to keep the prison running and suggested in the state of the Union address that the extremes of Islamic state or base armed personnel might be shut in. He told The Pentagon to reexamine the policy of detention. The Pentagon, 2, said in a statement that the White House has been proposed to the future of the security of the United States constitutes a continuing, major threat to the prison in Guantanamo. United States Defense Minister James Mathis said 1, the United States in Syria supported armed groups of more than 400 foreign extremist armed forces, to send them back to their country of origin is not easy, some countries have been deprived of their citizenship.