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Furious David Cameron has finally commented publicly on PigGate - and says he's 'too busy running the country' to sue the Tory donor who revealed the claims.

The Prime Minister had so far refused to 'dignify' allegations about a 'private part' and a dead pig's mouth during a youthful ritual at Oxford University.

But on a trip to a UN summit in New York he said people would 'see straight through' the motives for Lord Ashcroft's book, which made the claims last week.

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Lord Ashcroft himself confessed he wrote the unauthorised biography after being offered a low-level job despite donating £8m to the Tories.

The PM also said on the 'very specific issue' that made headlines, a 'very specific denial' had been made - even though that denial was actually a sweeping dismissal of the whole book.

(Image: Elliott Franks)

Asked directly about the allegation made in Call Me Dave by an anonymous MP, the PM said: "I can see why the book was written and I think everyone can see straight through it.

"As for the specific issue raised, a very specific denial was made a week ago and I've nothing to add to that."

Mr Cameron told Sky News he was "too busy running the country" to consider legal action.

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"If you do a job like this you do get people who have agendas and write books and write articles and write all sorts of things, but the most important thing is ... doing the job," he said.

He skipped questions about when he first knew about Lord Ashcroft's non-dom tax status, with the peer claiming it was as early as 2009.

"I dealt with all that before the election, and indeed we backed a law to make sure that you couldn't be a non-dom and sit in either the House of Lords or Houses of Parliament," Mr Cameron said.

(Image: PA)

"I answered all that at the time, frankly this book was written for a very clear reason and anyone can see why it was written."

The most extreme claim led to so-called David Hameron being mocked around the world .

A YouGov poll was even commissioned which found two thirds of people believed Lord Ashcroft's claims - though the majority didn't think they mattered.

Last week the PM joked he had been 'stabbed in the back' by a 'little prick'.

He told Tory backers at an exclusive Carlton Club dinner he went to the doctor after suffering a bad back from chopping too much wood.

As he lay on his stomach for an injection the surgeon said: "This will just be a little prick, just a stab in the back."

The PM replied it 'rather summed up my day'.

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