Former Tory minister Maria Caulfield has defected to Reform UK.
The former health minister, who now works as as full time nurse in the NHS, joined Nigel Farage’s party a month ago.
She is the 13th former Conservative MP known to have jumped ship to Reform UK.
Danny Kruger became the first sitting Conservative MP to defect to Reform on Monday.
Ms Caulfield told GB News 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.
She said: “I have joined. My husband joined a few months ago and I joined a month ago.
“The [Reform] party needs a lot of experience of people who know the system and can talk about this.”
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.”
East Wiltshire MP Danny Kruger, who was first elected as a Conservative MP in 2019, quit Kemi Badenoch’s party on Monday and was unveiled as Mr Farage’s latest recruit at a press conference.
Mr Kruger was previously chief speechwriter to David Cameron, writing the then-opposition leader’s “hug a hoodie” speech in 2006.
Later, he was Boris Johnson’s political secretary during the final stages of Westminster’s Brexit battles in 2019.
More recently he has been the most vocal critic of the proposed assisted dying Bill, driven by his strong Christian faith but in stark disagreement with his mother, Great British Bake Off judge Prue Leith.