A Sinn Fein team will travel to London on Monday for a series of meetings including meeting with Labour leader Jeremy Corbyn.

Protection of the Good Friday Agreement (GFA) is non negotiable, said McDonald. 

The British government has provoked anger after it said Irish citizens born in the north of Ireland cannot vote in a unity border poll or any other referendum under British law, and cannot have the same rights as other EU citizens.

Direct Ruler Karen Bradley blankly told the London parliament this week that Irish citizens living in the North of Ireland could not vote in any referendum.

Under current British legislation, voting rights of Irish and British people living in each other's jurisdiction are reciprocal. Bradley claimed this only extends to local and parliamentary elections.