The DUP has launched a withering attack on the special Oireachtas committee that was attended by Sinn Féin and SDLP MPs from the North yesterday.
The meeting, which was boycotted by unionists, marked the first time that Westminster MPs from the North have taken part in the Republic's parliamentary affairs.
The Oireachtas committee was set up to monitor the implementation of the Good Friday Agreement.
The DUP's Gregory Campbell has described it as an irrelevant sideshow and says MPs elected to Westminster should go there instead.
He says the establishment of the committee demonstrates an extraordinary level of arrogance on the part of the Irish Government.