The DUP leader, Ian Paisley, has accused the Northern Secretary, Peter Hain, of being deceitful about how far the IRA had gone to end all its activities.
He was speaking after meeting the Independent Monitoring Commission.
Earlier he had what he described as very good and useful discussions with the Catholic Primate, Archbishop Sean Brady, their first such meeting.
The two shook hands and smiled for the cameras before the 90-minute meeting began.
The need to develop support for the administration of justice and law and order formed part of their discussions, according to Archbishop Brady, who said: 'A lot of progress has been made. Hopes are now rising for further progress.'
Dr Brady said the talks were helpful and constructive.
Dr Paisley was joined at the meeting by DUP members Peter Robinson, Nigel Dodds and Gregory Campbell.
Dr Brady was accompanied by five members of the Northern Ireland Catholic Council on Social Affairs, Auxiliary Bishop of Derry, Dr Frank Lagan, Fr Tim Bartlett, Anne Gibson, Martin O'Brien and Deirdre O'Rawe.