Mohammed Ali Abdullah Bwazir marked 14 years of detention in the Guantanamo Bay US naval base in Cuba on Thursday, after rejecting an offer of release and transfer to Europe in January.
Obama’s goal is to transfer the 26 detainees on the transfer list by the end of August, a State Department official says.
Although American authorities do consider prisoners’ preferences for transfer, the final decision is up to the government, he said.
Of the 80 detainees left on the island – most of whom are Yemeni citizens – only 10 have been formally accused.
The US State Department is looking for countries that are willing to take them because Congress forbids their transfer to the United States.