First Minister Peter Robinson has warned of serious consequences if the next meeting of the Stormont Executive doesn't go ahead as planned in mid-September.
Ministers have failed to hold any meetings over the summer due to a row between Sinn Fein and the DUP over the devolution of policing and justice powers to Stormont.
The move was supposed to go ahead last May, but has been blocked by the DUP, which says unionists need more time to gain confidence in the IRA's future intentions.
Over the weekend, Sinn Fein TD Caoimhghin O Caolain warned that his party could withdraw from power-sharing and collapse the Assembly unless progress is made on the issue.
Sinn Fein has since rowed back on the comments and is calling for talks with the DUP.
However, Peter Robinson has accused republicans of damaging confidence even further and says all ministers have a legal responsibility under the pledge of office to support good governance in Northern Ireland.