The tánaiste (Irish deputy prime minister) has asked some political parties in both Northern Ireland and the republic for feedback on his party's so-called "blueprint" on Irish unity.
Simon Harris' party Fine Gael published proposals on how to prepare for Irish unity last week.
It came just days after the Taoiseach (Irish prime minister), who is leader of Fianna Fáil, circulated a document to his parliamentary party laying out his own thoughts on how to prepare for a united Ireland .
Among their proposals, Fine Gael has suggested appointing a junior minister in the Irish government for "north south relations" as well as establishing a forum on Irish unity.
The party also published a document by an economist who works as an adviser to Harris, where it was suggested that the first-year cost of reunification ranges from about €3bn (£2.5bn) to €25bn (£20.8) to the Irish exchequer.
Now Harris has sent his party's proposals to some political parties on the island, including those in Dublin and those in Northern Ireland.
He has asked for "views" on the plans as well as areas where there may be a need for "further consideration".
In a letter accompanying the proposals, he said: "No one political party owns the discussion about the future of this island, nor should any one party seek to determine its outcome.
"That is why I believe this must be an inclusive conversation, informed by evidence, respectful of different constitutional perspectives and grounded firmly in the Good Friday Agreement and the principle of consent," he wrote.
The party leaders who have been sent the letter in Northern Ireland are: Democratic Unionist Party leader (DUP) Gavin Robinson, Ulster Unionist Party (UUP) leader Jon Burrows, Social Democratic and Labour Party (SDLP) leader Claire Hanna, Traditional Unionist Voice (TUV) leader Jim Allister and Alliance leader Naomi Long.
The party leaders who were sent the letter in the republic are: the Taoiseach, Sinn Féin leader Mary Lou McDonald, Aontú leader Peadar Tóibín, Labour party leader Ivana Bacik, Social Democrat acting leader Cian O'Callaghan, Independent Ireland leader Michael Collins, Green Party leader Roderic O'Gorman and Richard Boyd-Barrett of People Before Profit.
"There will be differing views and difficult conversations, but complexity cannot become an excuse for inaction," wrote Harris.
"I would very much welcome your views on the proposals and the wider issues raised, including areas where we might identify common ground or where further consideration is required.
"I am writing to all major political parties across this island - I hope you will receive this report in the constructive and respectful spirit in which it is intended," he wrote in the letter, seen by BBC News NI.
