Dudley North MP, Ian Austin, made the remark as the Labour leader set out his response to the findings of the Chilcot report in the House of Commons.

During the outburst, which stunned many MPs, Ian Austin also called Mr Corbyn 'a disgrace'. It came during the Westminster debate on the inquiry into the invasion of Iraq, which Mr Corbyn described as an 'act of military aggression, launched on a false pretext'.

He also claimed the 'colonial style occupation' that followed had led to the rise of ISIS, and said that the war had 'long been regarded as illegal by the overwhelming weight of international legal opinion'.

The MP for Dudley North, who voted in favour of the inquiry, later said that it was time to 'lay to rest' the allegations of lies and deceit over Britain's involvement in the Iraq war. He said it was clear from the Chilcot report that there was 'no deception of the Cabinet' and 'no secret commitment to war'.

Mr Corbyn condemned the decision to go to war in Iraq in 2003 as an "act of military aggression launched on a false pretext", as he was heckled by his own MPs.

The Labour leader said the invasion and occupation of the country was a "catastrophe" as he responded to the findings of the Chilcot Report. He also said the war had "fuelled and spread terrorism" instead of improving security at home and abroad. Mr Corbyn was a fierce critic of the Iraq War, having previously described the action as "illegal".

However, Labour MPs, including Ian Austin, voiced their displeasure at Mr Corbyn's statement as he spoke. The Labour leader said:

"The decision to invade and occupy Iraq in March 2003 was the most significant foreign policy decision taken by a British government in modern times. It divided this House and set the government of the day against a majority of the British people as well as against the weight of global opinion.

"The war was not in any way, as Sir John Chilcot says, a last resort. Frankly, it was an act of military aggression launched on a false pretext as the inquiry accepts and has long been regarded as illegal by the overwhelming weight of international legal opinion."

He added: "By any measure the invasion and occupation of Iraq has been, for many, a catastrophe."