The former Tory leader said that Richard Tice's party will "simply strip votes away" from the Conservatives - and give Labour a majority government able to "bulldoze" laws through Parliament.
Sir Keir Starmer wants to build a closer trading relationship with the EU if he wins the election.
Sir Iain went on: "As someone who voted against the Maastricht Treaty in the 1990s, and against every single additional treaty following that, and as someone who was deeply involved in the Brexit campaign, I have of course sympathy for those who are frustrated that the pace of change has not happened as they had hoped.
"Whilst some significant things have been delivered, there is yet much more to be done. There is, of course, still more to be done to take advantage of the flexibility and independence that Brexit provides.
"Despite that frustration, we need to look at the reality of what could happen at the next election.
"Any vote for Reform is taking away only from the Tories. If you want to re-enter the European Union and if you want to align closer to Europe as Labour plans to do - if you want to have an unsustainable rush to net zero with extra taxes and regulations, then if you vote Reform, that is exactly what you will get." Sir Iain continued: "You will get a Labour government with a large majority that will be able to bulldoze anything they want through.
"All of the things that anyone who votes for Reform stands for will be lost. The only hope they've got is a Conservative Party that gets on and does what is necessary. To do that, they need another mandate."
Defence Secretary Grant Shapps insisted that "a vote for Reform is a vote for Labour" and risks "irrevocable damage" to Britain.
Denne historien er fra March 30, 2024-utgaven av Daily Express.
Start din 7-dagers gratis prøveperiode på Magzter GOLD for å få tilgang til tusenvis av utvalgte premiumhistorier og 9000+ magasiner og aviser.
Allerede abonnent ? Logg på
Denne historien er fra March 30, 2024-utgaven av Daily Express.
Start din 7-dagers gratis prøveperiode på Magzter GOLD for å få tilgang til tusenvis av utvalgte premiumhistorier og 9000+ magasiner og aviser.
Allerede abonnent? Logg på
Slo torture as Brits waste a golden chance to end hoodoo
BOULTER RUNS OUT OF GAS AND TEAM LOSE THEIR WAY
BY EDDIE DID ME A FAVOUR HAVING A GO
Ollie changed after Jones attacked his 'bad attitude'
HILL DOESN'T TOP BILL
NICKY HENDERSON insisted there is \"nothing wrong' with Constitution Hill after his stable superstar was deposed as Champion Hurdle favourite yesterday.
THE ALTERNATIVE UNDERTAKER
From clifftop ceremonies to campervan-driven vigils and funeral pyres, Rupert Callender s revolutionising the 'bad theatre' that characterises the business of death in modern Britain
Cock-a-doodle-don't!
Residents have sleep shattered by bird's noisy 3am squawking
Mission to revive boxer pupfish after zoo finds it has the only one left
A ZOO is spearheading a conservation effort to save a rare fish species from extinction - after discovering it had the last remaining boxer pupfish.
'I'll never forget the horror in my dying husband's eyes'
A WIDOW who watched her husband choke to death due to cancer says she will never forget the look of horror in his eyes.
Gisele blasts the 'cowards' accused.of her many rapes
A FRENCHWOMAN who was sexually violated by scores of men after her husband drugged her called them all \"cowards\" yesterday as she gave evidence for the last time.
5,000 calories per day and no nature documentaries
Rev Richard Coles on lax pre-jungle routine
A criminal abuse of 'Stasi' police powers Pictures: GETTY
THE SINGLE most appalling aspect of the Allison Pearson story is that she was not told of what exactly she was accused.
