Saudi Arabia has confirmed the arrival of a prisoner who was returned from the Guantanamo Bay detention center to serve out the remainder of his 13-year sentence, AP reported. Ahmed Mohammed al-Darbi is the first detainee to leave the US base in Cuba since President Donald Trump took office. The Pentagon first announced the transfer in a brief statement on Wednesday. The Saudi state security service confirmed that al-Darbi arrived just before midnight on Wednesday, and his relatives had been notified. After serving the remainder of his sentence, al-Darbi will spend time in a Saudi rehabilitation center for convicted extremists, which aims to help them to assimilate back into society. The process includes visits with relatives, religious counseling with moderate clerics, art therapy, and even cash to help them after they are released.