Britain’s High Court on Friday rejected an autistic British man’s bid to avoid extradition to the United States to face trial for hacking into military computers.

Gary McKinnon, who claimed he was searching for evidence of UFOs, has fought a long legal battle against extradition after he was charged with breaking into 97 computers belonging to NASA, the U.S. Department of Defense and several branches of the U.S. military soon after the Sept. 11, 2001, terrorist attacks.