Commons leader Andrea Leadsom confirmed the advice they tried to keep secret would indeed be published this morning after a humiliating defeat last night.
MPs voted to defy the Government and release the full documents – rather than just a summary.
It was just one of three votes Theresa May's administration lost last night, and marks the first ever time ministers in a British Parliament has been found in contempt.
But Ms Leadsom said this morning: "I think any parliamentarian who wants at some point in the future to be in Government is going to live to regret their vote last night."
She said it undermined "decades if not centuries of convention" where ministers were able to receive advice in secret.
And she would only back Mrs May as PM "at the moment".
The Prime Minister will face PMQs in the Commons later today, followed by the continuation of the debate on her Brexit deal.
MPs will have their crunch vote on it next week – where the PM is all but certain to lose.
The news comes as:
- The Sun revealed the Chancellor had set aside £2billion more in funding for a No Deal Brexit
- The head-to-head between Jeremy Corbyn and Theresa May on the BBC was scrapped after failing to agree on how to do it
- MPs warned she has only once chance to save her Brexit deal – buy fixing the hated Northern Irish backstop