Amnesty International is calling on the Irish Government and the EU to apply political pressure on Egypt in the case of Ibrahim Halawa.
Ireland's leading human rights group says it is "deeply concerned" for the welfare of 19-year-old Ibrahim Halawa who has been detained in an Egyptian prison for over a year and a half.
If convicted he could face the death penalty.
The Dublin teenager was due to face a mass trial in Cairo yesterday, but his court date has now been adjourned for a fifth time until April 26.
Colm O'Gorman, Executive Director of Amnesty International Ireland, says Ibrahim is an Irish citizen and needs help from the Irish Government.
Mr O'Gorman said: "He's now been in prison for 19 months on nothing more than trumped up charges.
"I know that there has been consular assistance in the case on an ongoing basis, but I also know there are complications around this case given that Egypt are asserting that Ibrahim is an Egyptian national.
"Despite the fact that he has never held an Egyptian passport, we would urge the Irish Government, and indeed the EU, to do everything they possibly can to apply political pressure on Egypt."