Enda Kenny has warned the British Prime Minister that nothing should happen to put the Good Friday Agreement at risk.
The outgoing Taoiseach spoke with Theresa May by phone this morning and expressed concern about the deal she proposes to make with the DUP.
He's also suggested that she meet with Leo Varadkar as soon as possible to discuss Brexit and the lack of a Northern executive.
There's a fear that any agreement between the DUP and Conservatives could undermine Westminster's impartiality in the peace process.
Sinn Fein's Gerry Kelly says that issue will definitely be in the spotlight over the next few days:
Earlier, the DUP said no deal has yet been reached with the Conservatives to keep British Prime Minister Theresa May in power.
Yesterday Downing Street released a statement saying an "outline agreement has been reached" - but sources say that this was released in error.
The DUP says discussions will continue next week.
Sky News correspondent David Blevins is in Belfast and says nothing has been agreed:
Meanwhile, Fianna Fail says any UK coalition involving the DUP will need 'careful monitoring'.
Foreign Affairs Spokesman is Darragh O'Brien: