A verdict is set to be delivered today in the case of Firhouse man Ibrahim Halawa.
The 21 year old, who has been imprisoned in an Egyptian jail for almost four years, was arrested when he was 17 during a siege at the Al-Fath mosque in Cairo in 2013.
He has been accused along with nearly 500 others of inciting violence, riot and sabotage.
The trial finally got under way this month, having been adjourned 30 times.
In a planned phone call later Taoiseach Leo Varadkar is expected to ask Egyptian President Abdel Fatal el-Sisi for Mr Halawa to be allowed to return to Ireland after his trial.
Mr Sisi has previously suggested he will pardon the prisoner if he is convicted – but has refused to act before the end of the trial so as not to interfere with the judicial process.