PEERS have launched a furious attack on ministers ahead of today's EU withdrawal bill, which they say is "unprecedented" power grab.
Members of the House of Lords have hit out at extreme plans so that all EU law can be put in place in Britain once we leave the bloc.
MPs are also growing angry about the so-called 'Henry VIII' powers – and last night Theresa May offered to compromise with those concerned.
In a fresh report peers say they have "profound concerns" about the powers that ministers will be given to wave laws through, and claim their objections have been "ignored".
And they also argued that ministers had "misquoted" their views to make it seemed like they supported the Bill.
Usually all new laws are subject to intense scrutiny by MPs, but the 12,000 changes that need to be made to adopt various legislation after we leave the EU means that could take years.
Ministers want the power to be able to make the changes to adopt all EU laws, but there are fears this will be used again later on down the line with other policies.
Peers said the extra powers must ONLY be used to make technical changes as a result of Brexit and must NOT be used for future bills.
The report said that there are numerous "uncertainties and ambiguities" in the Bill and the wording is "highly complex and convoluted".
The Chairman of the Committee who produced the report, Baroness Taylor of Bolton, said that the plans will create "real difficulties" for parliament to fulfil its role in scrutinising the Bill.
She went on: "We acknowledge that the Government needs significant powers in order to deliver legal certainty after Brexit.
"However, we warned the Government that such powers must come with tougher parliamentary scrutiny mechanisms and we are disappointed that we have not only been misquoted by the Government, but that our key recommendations have been ignored."
MPs are set to start debating the Bill for the first time today – but there is a risk of a rebellion on the issue of the extended powers.
There will be a vote on Monday, and Labour are expected to oppose it on the same grounds.
A spokesman said it was making a "power grab to change a whole set of legislation and rules without recourse to Parliament."
"Under the proposals, the Brexit Secretary can make these changes at the stroke of a pen. That is completely undemocratic."
But Mrs May said she will “listen very carefully” to MPs’ concerns – a big hint she will bring in changes.
As well as delivering on voters’ verdict, she also argued the bill is also “the single most important step we can take to prevent a cliff-edge for people and businesses, because it provides legal certainty”.
In another bid to build consensus, Brexit Secretary David Davis also invited MPs on all sides to work with him to deliver the jumbo law.