Mary Lou McDonald: Government should start planning 'unity' referendum

Sinn Féin says the Government should start planning for a 'unity' referendum for Ireland, given the uncertainty surrounding Brexit.

Latest: A hardening of the border will be met with a demand for a unity referendum, the Sinn Féin president has told a Brexit conference.

More than 1,500 people attended the Beyond Brexit event in Belfast, which examined the future of Northern Ireland and the Republic after the UK leaves the EU.