A proposed law giving the UK Government the power to override parts of the Brexit agreement with the EU "jeopardises" the Good Friday Agreement, civil society leaders have claimed.
The Internal Markets Bill - which MPs have backed - would break international law "in a very specific and limited way", Secretary of State Brandon Lewis has previously admitted.
Now representatives of civil society groups have said that the actions of the Government are "jeopardising" the Good Friday Agreement and the functioning of the devolved administration at Stormont.
The groups, which include the Human Rights Consortium, Equality Coalition and Unison, have described the actions of the Government as "contravening" international law and "undermining" the provisions of the Protocol in terms relating to the non-diminution of rights and equality protections.
"This Bill fetters the ability of our devolved government to continue to take the progressive actions required to protect rights and standards in Northern Ireland, if the UK Government disagrees," the groups said in a joint statement.
"We condemned these actions in the strongest possible terms and we demanded that the UK Government withdraw the Internal Market Bill and unequivocally commit itself to the European Convention on Human Rights."
The groups met with Government officials last week to share their concerns, and expressed disappointment that ministers did not attend the meeting.
"We have insisted that the Secretary of State for Northern Ireland engage with civil society fully. We will be writing to the Secretary of State to demand that he do so as a matter of urgency," they said.
"The Protocol does not just deal with tariffs and trade, though avoidance of a hard land border is vital.
"Its full implementation is also fundamental to the protection of equality and human rights which form the bedrock of the Good Friday Agreement."
A UK Government spokesperson said yesterday: "The UK Government's top priority is to protect the Belfast/Good Friday Agreement and gains of the peace process. Our approach is at all times guided by these priorities."