Rishi Sunak has been dealt a fresh blow as a group of hardline Tory Brexiteer MPs branded a key part of his deal with the EU "practically useless".
It comes as the Prime Minister prepares for a showdown in the Commons on Wednesday over his Windsor Framework agreement with the bloc.
The European Research Group (ERG) has not revealed how they will vote - but their highly critical report published on Tuesday is the strongest sign yet they will rebel.