A spokesman for Mr Corbyn said he had 'unintentionally' pressed favourite

It compared the Labour MPs' fling to claim Mr Cameron violated a dead pig

Jeremy Corbyn was tonight dragged into the scandal over David Cameron's alleged violation of a dead pig after appearing to compare it to his relationship with Diane Abbott.

The Labour leader 'favourited' a message sent to him on Twitter which read: 'Which is worse? F****** a pig or f****** Diane Abbott?'

Mr Corbyn is reported to have had a fling with his fellow Labour MP in the 1970s while estranged from his first wife.

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Jeremy Corbyn was tonight dragged into the scandal over David Cameron's alleged violation of a dead pig after appearing to compare it to his relationship with Diane Abbott

The favourited message appeared on the Labour leader's official Twitter account this morning following the publication of a bombshell extract from a new biography of Mr Cameron.

According to the former Tory party treasurer Lord Ashcroft's book 'Call Me Dave' Mr Cameron once 'put a private part of his anatomy' into a dead pig's mouth as part of an initiation ceremony for a debauched Oxford dining society.

A spokesman for Mr Corbyn confirmed that the offensive message about Ms Abbott had been favourited by the Labour leader's official Twitter account.

He said: 'It's obviously completely un-intended, accidental. Jeremy or somebody else has obviously accidentally pressed the favourite button. It's very easily done.'

Ms Abbott, who supported Mr Corbyn's leadership bid and was promoted to shadow international development secretary last week, has not commented on the claims the pair had a fling.

Mr Corbyn is reported to have had a fling with his fellow Labour MP in the 1970s while estranged from his first wife

The new Labour leader has been a friend and colleague of Ms Abbott's since campaigning together in the 1970s

Mr Cameron has refused to comment on the new biography – insisting he would not 'dignify' the allegations.

Other leading politicians have taken to Twitter to joke about the 'piggate' storm.

Lib Dem leader Tim Farron joked that after hearing the revelation he was glad to be a vegetarian, while Lord Ashdown joked that Mr Cameron was always 'hogging' the headlines.

The pig initiation claim sparked widespread hilarity online, with thousands of messages posted on Twitter mocking the Tory leader as 'David Hameron' and romantically linking him to the Muppets' Miss Piggy.

Under the hashtag 'piggate', one Twitter user Ben Almond suggested the infamous picture of Ed Miliband looking disgusted eating a bacon sandwich 'makes a lot of sense now'.

Others dug out pictures of the Prime Minister on farms in his Oxfordshire constituency holding pigs.

According to the former Tory party treasurer Lord Ashcroft's book 'Call Me Dave' Mr Cameron once 'put a private part of his anatomy' into a dead pig's mouth as part of an initiation ceremony at Oxford

The right-wing journalist James Delingpole (right, pictured with his brother left) claimed that the Prime Minister (centre) smoked drugs at university

In the book Lord Ashcroft – who fell out with Mr Cameron after the Prime Minister failed to give him a job in the Coalition government – makes allegations of drug taking and debauchery by a young Mr Cameron.

The book claims Mr Cameron was a member of a 'dope smoking group' called the Flam Club at Oxford University and that cocaine was later allowed to circulate at his and his wife's London home.