First Ministers will co-operate on Brexit
Arlene Foster and Martin McGuinness have said their joint attendance at a meeting with Brexit Secretary David Davis "sends out a clear signal we are determined to work together".
Mr Davis yesterday said he had a "constructive and amicable" meeting with his counterparts from the devolved administrations on plans to leave the EU.
He laid out plans for the Government to hold monthly meetings of the EU Negotiation Joint Ministerial Committee, enabling the Scottish and Welsh administrations - and the Northern Ireland Executive - to share analysis as part of a "two-way information flow".
Mr Davis said the moves would allow the devolved administrations to voice their views as the government prepares for divorce talks with Brussels.
Speaking after the meeting, the First and Deputy First Ministers said: "Our attendance sends out a clear signal that we are determined to work together to champion the interests of the people we represent.
"We have received assurances from the Prime Minister down that the Northern Ireland Executive will be fully represented in the negotiating process. We will ensure that those promises are honoured."