The DUP, of which Mr Robinson is leader, has tabled an assembly motion for Monday seeking an apology.

BBC: Peter Robinson seeks Irish government apology

In July the DUP was unsuccessful in gaining support in the assembly for a motion to exclude Sinn Fein's two ministers from the executive.

BBC: Loyalists protest at hospital visit

Earlier this year, the assembly backed a motion expressing concern at the "poor state" of the public transport system and seeking a comprehensive and integrated policy to be implemented.

BBC: Northern Ireland Railways train