Several ministers were understood to have spoken against it, with some even resigning. Here's everything we know.
Which ministers have resigned over Theresa May's Brexit draft agreement?
The biggest blow to Theresa May's EU proposals are is the departure from the Cabinet of Brexit Secretary Dominic Raab.
He said that he "cannot in good conscience support" the agreement.
Mr Raab – a Leave supporter who was promoted to the cabinet to replace David Davis when he quit in protest at Mrs May's Brexit plans – is among a group of senior ministers thought to be unhappy with the agreement.
He was closely involved in drafting the agreement, which sets out the terms of Britain's departure from the EU.
Mr Raab said in his resignation letter that he could not support it because the regulatory regime proposed for Northern Ireland "presents a very real threat to the integrity of the United Kingdom".
And, he added, the "backstop" arrangements aimed at preventing the return of a hard Irish border would result in the EU "holding a veto over our ability to exit".
"Above all, I cannot reconcile the terms of the proposed deal with the promises we made to the country in our manifesto at the last election," he told the prime minister.
Who else has resigned over the draft agreement?
Earlier on Thursday, Shailesh Vara quit as minister of state for Northern Ireland, saying he cannot support Mrs May's agreement.
He said the proposal "leaves the UK in a halfway house with no time limit on when we will finally be a sovereign nation".
Esther McVey, Secretary of State for Work and Pensions, quit and told the PM: "Your deal does not honour the result of the referendum."
Conservative Brexiteer MP Anne Marie Morris said she believed enough Tory MPs had now sent letters to the chairman of the 1922 committee to trigger a leadership contest.
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