Minister for Justice Charlie Flanagan has said the UK must stand over the Brexit agreement reached in December by putting its commitments in writing.

He was speaking in relation to comments made by EU chief negotiator Michel Barnier yesterday, in which Mr Barnier said the issue of the border "must be precise, clear and unambiguous".

Speaking on RTÉ's Saturday with Justin McCarthy, Mr Flanagan, a former minister for foreign affairs, said the agreement reached between Ireland and the UK still stands, but needs to be committed to in writing.

When asked if the agreement was still as cast-iron as before, Mr Flanagan said: "Very much so, that December commitment to avoid a hard border still very much stands, and that’s what the British government are saying.

"What we need to do now is what Mr Barnier said and he is quite right, that we need a greater level of clarity, we need to be moving toward written solutions - specific solutions the details of which we haven’t seen yet." 

He added: "We need to ensure what was said in December, in terms of the regulatory framework is committed to in writing.

"What we are seeing is the European Union, the 27 EU member states, in line with exactly the Irish position... it's up to the British government now to produce their commitments to writing."

Speaking on the same programme, Fianna Fáil TD Niall Collins said his party was fully supportive of the Irish Government in its stance.

He said that Fianna Fáil were also happy to see the solidarity and cohesion that the EU 27 were demonstrating toward Ireland.