Up for discussion were Brexit and attempts to discuss restoring power-sharing in Northern Ireland. "Without that voice people in Northern Ireland will be disadvantaged in a major way and will be essentially relying on others to make the case for them".
Northern Ireland has been without a powersharing Executive since March and without a First and Deputy First Minister since January.
During his day in Belfast, he will meet Northern Ireland Secretary James Brokenshire and will also hold meetings with the five main Stormont parties.
Talks between the Democratic Unionists and the Conservatives have not been going as expected, according to DUP sources.
The Commission found Mr Harris, who spent a total of £421,432.64 during the campaign, failed to deliver his spending return and audit report on time - an offence when the campaigner has spent more than £250,000.
DUP senior negotiator Simon Hamilton hoped that the DUP-Tory talks would conclude soon.
Normally in the run-up to a Queen's Speech, Westminster watchers wonder how radical the Prime Minister feels like being - and how much political capital they have available to spend. We are working away at them and we will continue to work away at them.
Among the ten MPs that the Tories want to bring onside is Ian Paisley Jr, the son of "Save Ulster from Sodomy" leader Ian Paisley who founded the DUP.
Mr Varadkar, one of three openly gay world leaders now in office, revealed today that he has pressed the DUP over their questionable use of "Petitions of Concern" to block all progress on marriage equality. All parties should state clearly they are behind the direction of travel outlined by experts from Maurice Hayes in 2001 to Rafael Bengoa this year.
It is thought the DUP is asking for more investment for Northern Ireland as part of the price of its support, and the party also wants the retention of the triple lock guarantee on pensions and winter fuel allowances for older people. We put forward our case for special status.
High court judges would be asked to examine whether the pact breaches the British government's commitment to exercise "rigorous impartiality" in the Good Friday agreement. It is an alternative to Brexit.
A Conservative source said: "Talks are ongoing with the DUP and we continue to work towards a confidence and supply arrangement".
Ms O'Neill would not be drawn on the prospects of a deal being achieved by the June 29th deadline.
"The issues causing this impasse are not Sinn Féin issues".