A Downing Street spokesperson said:
The Prime Minister and the Taoiseach spoke yesterday evening.
They recognised the difficulties and seriousness of the situation in Northern Ireland and how important it was to work together – with the Irish government and the parties of Northern Ireland – to find a solution.
In addition, they spoke about how the Northern Ireland Secretary and the Irish Minister for Foreign Affairs and Trade, Charlie Flanagan, will be working very closely together over the next few days and months to support the parties of Northern Ireland in finding a resolution.
The Prime Minister also said how important it was to make sure that Northern Ireland’s voice and interests are heard as we prepare to leave the European Union and how the Northern Ireland Secretary is fully committed to making this happen.
She added that it was still our intention to hold a Joint Ministerial Committee at the end of the month to bring the devolved nations together in getting the best deal for the whole of the United Kingdom.
They also agreed to maintain regular contact over the comings months.