A group of five ministers in Theresa May's top team are hoping to persuade her to make changes to her draft Brexit deal, the BBC understands, BBC reports.
Leader of the Commons Andrea Leadsom is believed to be co-ordinating the group.
The five ministers include Michael Gove and Liam Fox - who on Friday publicly threw their support behind the PM - plus Penny Mordaunt and Chris Grayling.
Mrs May published her draft withdrawal agreement with the EU on Wednesday, and has vowed to "see it through".
The 585-page document sets out the terms of the UK's departure and includes details such as how much money will be paid to the EU, details of the transition period and citizens rights.
The deal prompted the start of a tumultuous few days for Mrs May, with two senior ministers and several other junior ministers and aides resigning.