The British government has "forfeited any mandate" to represent the interests of people in Northern Ireland after British voters opted to leave the European Union in a historic referendum, Irish nationalist party Sinn Fein said on Friday.
The referendum resulted in "English votes overturning the will of people here in the north of Ireland [where] republican and unionist, Catholic and Protestant people have voted in favour of Remain," Sinn Fein national chairman Declan Kearney said in a statement.
Kearney said the result "dramatically changes the political landscape here in the north of Ireland and we will be intensifying our case for the calling of a border poll under the provisions of the Good Friday Agreement."
He was referring to a cross-border vote on a united Ireland. The 1998 Good Friday Agreement formally ended decades of sectarian conflict in Northern Ireland.
Voters in Northern Ireland chose Remain by a majority of 56 per cent in Thursday's referendum.