Omar Deghayes fled to the UK from Libya in the 1980s
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A Brighton law student detained at Guantanamo Bay is to have his case presented to authorities in Washington.
Omar Deghayes, 36, has been imprisoned at the US military base in Cuba since his arrest in Pakistan in 2002.
The American political counsellor in Europe has now promised to present a dossier on his case to the White House.
Kyle Scott made the agreement in Brussels on Friday after meeting Green Party MEP, Caroline Lucas, and Mr Deghayes' brother Abubaker.
Other campaigners fighting for the release of Mr Deghayes were also at the meeting.
The group had travelled to Belgium to speak at the European Conference on Human Rights, lobby MEPs and visit the US Ambassador.
Mr Deghayes was granted refugee status in the UK after fleeing Libya with his family in the 1980s when his father was assassinated.
The Save Omar Campaign held a demonstration at last month's Labour Party conference in Brighton to highlight his case.