The Labour Party has called on the Government to stop the deportation of failed asylum seekers, following the case of a Nigerian Leaving Cert student sent home last week.
The Minister for Justice, Michael McDowell, said the case went through two independent reviews and he would not be intervening.
The second level teachers' union, the TUI, earlier expressed its concern at the deportation of 19-year-old Olunkunle Eluhanla.
He was due to sit his Leaving Certificate in June but was deported last week.
In a statement, the TUI said scant regard seemed to have been paid to humanitarian and other considerations, and it called on the authorities to reconsider.
This morning, the Socialist TD Joe Higgins called upon the Minister for Justice, Michael McDowell, to use his discretion to reverse the deportation.
Speaking on RTÉ’s Morning Ireland, Mr Higgins said the schoolboy's classmates in Palmerstown Community School had been left traumatised by the situation.
Mr Higgins added that the minister was wrong in saying Mr Eluhanla had not been deported in his school uniform.
Last night, Mr McDowell rejected calls for Mr Eluhanla to be allowed back into Ireland.
Speaking at the Association of Garda Sergeants and Inspectors conference, he said that the asylum system would be in chaos if the Government was to adopt a policy of granting asylum to orphans.
Mr McDowell said that much of the reported facts surrounding the case were in dispute.
He said that the schoolboy had been given 'very generous educational facilities' by the State and said that the young man's case was examined twice by two independent bodies and he was found ineligible for asylum here.
The Chief Executive of the Irish Refugee Council, Peter O'Mahony, has described the deportation as 'inexcusable'.
Mr O'Mahony said the generous education that the minister referred to was now wasted because the schoolboy was thrown out of the country.