Former President Mary McAleese says Northern Ireland is changing towards having a nationalist majority.
On the day the UK was supposed to leave the EU, Professor McAleese said the Brexit process is driving a constitutional change both North and South.
Following the result of the Brexit referendum, then Taoiseach Enda Kenny secured an agreement with the EU that Northern Ireland would seamlessly re-join the bloc if the North and South were to reunite.
Prof. McAleese said it has always been known that the issue would come onto the agenda.
She said: "The issue of the ending of partition would come onto the agenda driven by demographics, the demographics in Northern Ireland are changing rapidly towards a Catholic/Nationalist majority.
"That's a reality that has to be taken into account, but Brexit put a different spin on things."
