Sinn Féin's Gerry Adams has said the North's former First Minister Peter Robinson is “making a show of himself”.
It comes as the Taoiseach Enda Kenny and the British Prime Minister David Cameron appealed yesterday for politicians in the North's power sharing agreement to move past their personal issues.
Fresh negotiations between Sinn Féin and the DUP are due to take place on Monday in an effort to avoid the collapse of the Stormont institutions.
However, Sinn Fein's President Adams has said Robinson has let himself down, and there is now a lack of public confidence in the talks.
“I think he is making a show of himself,” said Adams.
“We have tried to be very, very measured in how we deal with all of this. I went back to Belfast last evening and everyone I met was just in exacerbation about where we’re at.”