Stephen Crabb has resigned as work and pensions secretary after just four months in the role, and has been replaced by MP for Ashford Damian Green.
A statement from Crabb says: “After careful reflection I have informed the Prime Minister today that, in the best interests of my family, I cannot be part of her government at this time.”
Crabb says he looks forward to “supporting the government’s One Nation vision from the backbenches”.
Crabb was appointed work and pensions secretary in March, following the resignation of Iain Duncan Smith.
Green was former minister for policing and criminal justice and is also a close ally of Theresa May.
Over the weekend, The Times reported Crabb had been sending “flirtatious and sexually charged” WhatsApp messages to a woman he met through his political role several years ago.