The Scottish leader goes into the 'political cabinet' meeting having also spoken openly of her concerns at Ms May’s attempts to win a deal with the DUP, needed to secure the Prime Minister a Commons majority.
Ms Davidson sought to play down her appearance today, taking to Twitter to point out that she has an open invitation to attend political cabinet meetings in Westminster and has done in the past.
But the Scottish leader's significance to the party's Brexit plan and other issues, is underlined by her having led the party north of the border to win 12 extra seats that are critical to Ms May's ability to pass laws.
Amid the fallout of last week's election campaign, she gave interviews saying she wanted a consensus on a Brexit deal that puts economic advancement and jobs at its heart, something seen as a different path to Ms May's focus on immigration.
Asked whether the Government would be changing course, Ms May's spokesman said on Monday: "We are going to deliver the wishes of the British people and that was to retake control of our borders and our laws."
But Ms Davidson is part of a powerful new soft-Brexit axis at the top of the Tory party, along with Chancellor Philip Hammond, who is said to have demanded a 'jobs first' approach as a condition of backing Ms May's leadership.
Damian Green, who backed remain in last year's referendum, has also been appointed First Secretary of State, a title which effectively makes him Ms May's deputy.
More about: #RuthDavidson #TheresaMay #GeneralElection2017
