The Government has said it does not believe British plans to give an amnesty for unsolved killings during The Troubles is in compliance with the European Convention on Human Rights (ECHR).
However, the British government said it will go ahead with the new law, concerning the investigation of over 1,000 unsolved killings.
The so-called legacy issue was one source of friction between the two governments at the British Irish Intergovernmental Conference (BIIGC) today.
The British government is unilaterally setting up a new body called the Independent Commission for Reconciliation and Information Recovery which would investigate the killings.
It would give an amnesty for British soldiers found to have committed crimes, as well as paramilitaries.
However, it can also close down all other legal actions including civil cases and inquests as well as criminal prosecutions.
The move has been criticised by all parties in Northern Ireland, the UN, the US Congress, and the Council of Europe.
Tánaiste Michéal Martin said the Irish Government does not believe the new law is in compliance with the ECHR.
Northern Ireland Secretary Chris Heaton-Harris said the bill is not perfect but nothing around legacy is.
