Tony Taylor has been incarcerated in Maghaberry prison since March 2016 after his release licence was revoked after MI5 claimed his activities breached his licence.
His legal team have argued these allegations should be determined by the sentencing judge who jailed him at Belfast Crown Court
Martina Anderson said:
“I addressed the chamber in the European Parliament in Strasbourg last night and raised the case of imprisoned Derry man, Tony Taylor.
“I told MEPs that his continued imprisonment is an affront to justice and democracy.
“His continued detention is wrong and needs to end.
“I told the Parliament that he should be released immediately or brought before a court.
“On Friday, Elisha McCallion MP, Raymond McCartney MLA and I will be going to Maghaberry to visit Tony Taylor and we will once again call for his release.”