Nadine Dorries is to stand down as Culture Secretary after Liz Truss replaced Boris Johnson as Conservative leader.
An ultra-loyalist to Mr Johnson, Ms Dorries backed Ms Truss during the leadership election but she said she believed it was the right time to go.
Ms Truss will fly to Balmoral to meet the Queen for the formal handover of power from Mr Johnson and become Britain's 56th Prime Minister later today.