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Key members of Bernie Sanders' doomed campaign to win the White House have flown to the UK to help Mr Corbyn. The left-winger was trounced by Hillary Clinton in last year's race to become the Democratic Party's presidential nominee. But Labour believes it can learn from his unsuccessful campaign as the June 8 election edges closer.

In contrast, the Tories are working with Jim Messina – a top strategist who helped Barack Obama win the 2012 Presidential election. Allies of Mr Sanders gave advice to Mr Corbyn's team during the Labour Party leadership election last summer. But next month's snap vote is a much bigger challenge for the hapless UK socialist – with opinion polls predicting a crushing Labour defeat.

GETTY Jeremy Corbyn is working with members of Bernie Sanders' campaign team

Snap election 2017: The pictures politicians may not want you to see Sat, May 27, 2017 Protests, fights and daleks, it all happened when the politicians hit the campaign trail for the snap election Play slideshow Getty Images 1 of 48 A UK Independence Party supporter (L) scuffles with a pro-europe supporter ahead of a visit by UKIP leader Paul Nuttall to Hartlepool

We are in touch with Bernie's team, they are helping us Jeremy Corbyn

Jeremy Corbyn said: "We are in touch with Bernie's team. They are over here helping us. "We also, during the leadership campaign, looked at a lot of their campaigning methods. "And again some people came over and and gave us advice."

GETTY The Labour leader is set for a crushing defeat, according to opinion polls

Momentum, a major pro-Corbyn group, has also aligned itself with Mr Sanders. Supporters of the Senator's unsuccessful White House bid have spoken at Momentum events across the country in recent days. They passed on tips about their time on the campaign trail and how to sell Mr Corbyn's hard-left policies to voters.

GETTY Pro-Corbyn group Momentum has aligned itself with the US Senator

The Islington North MP hopes Mr Sanders will officially endorse his campaign to become Prime Minister. He told the Guardian: "I can't say [if he will endorse me]. I hope he will. I think he probably will, actually. But we mustn't predict these things." Mr Sanders – whose brother Larry is standing for the Green Party – is travelling to the UK next month to give a series of speeches.

GETTY Islington North MP Corbyn hopes Sanders will endorse his campaign