Another former Conservative MP has jumped ship to join Reform UK, GB News can disclose.
Maria Caulfield, a former health minister who now works as as full time nurse in the NHS, joined Nigel Farage's party a month ago.
The news has emerged the day after Danny Kruger became the first sitting Conservative MP to defect to Reform UK, and will alarm Tories worried about support leaking to Reform UK under leader Kemi Badenoch.
Ms Caulfield - who was Tory MP for Lewes from 2015 to 2024, and served as a health minister from 2022 to 2024 - is the 13th former Conservative MP to switch her allegiance to Reform UK.
Ms Caulfield told GB News' Christopher Hope that it was the same people who were dismissing the chances of Leavers winning the EU referendum who were dismissing Reform now.
She said: "If you are Conservative right-minded, then the future is Reform. The country is going to change a lot.
"The same people who thought that Brexit would not happen think that Reform will not happen. They are in for a shock."
She said she had jumped ship to Reform UK four weeks ago, months after her husband quit to join the insurgent party.
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Maria Caulfield was a Tory MP for Lewes from 2015 to 2024, and served as a health minister from 2022 to 2024
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She said: "I have joined. My husband joined a few months ago and I joined a month ago."
Ms Caulfield joins former Conservative MPs Lee Anderson, Nadine Dorries, Sir Jake Berry, Adam Holloway, Anne Marie Morris, Sir David Jones, Marco Longhi, Ross Thomson, Dame Andrea Jenkyns, Aidan Burley, Alan Amos and Henry Smith who have joined Reform.
Mr Kruger is the only serving Conservative MP who has jumped ship.
Ms Caulfield said: "The [Reform] party needs a lot of experience of people who know the system and can talk about this."
Nigel Farage announced the defection of Danny Kruger yesterday
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She added: "I am sad for the Conservative Party. I could see that I have not changed but the party has become less and less what I believe in.
"We let people down over what Brexit meant on laws, money and borders. We took back control but we did not do anything about it.
"Reform is about changing the system - they won't change unless they do it differently."
Ms Caulfield heaped praise on Kruger saying that he "knows how things work - he has that experience which is crucial".
Ms Caulfield did not rule out a return to frontline politics with Reform.
"I will see what happens," she told GB News.