The Telegraph is live on Snapchat Discover now!https://t.co/vnOkjut4UU pic.twitter.com/S832NNtFD9— The Telegraph (@Telegraph) June 5, 2017 Labour Party leader Jeremy CorbynCredit:Getty Our manifesto: Real political insight, free for 30 days.Rely on unrivalled insight and sharp analysis from our stellar team of Westminster insiders.Join the most trusted voice in politics. Follow Election 2017 with Telegraph Premium.Start your no obligation, 30 day free trial today. Boris Johnson has launched an attack on Jeremy Corbyn Credit:AFP Boris Johnson says he would be “deeply ashamed” if the “curiously vested” Jeremy Corbyn defeats Theresa May in the upcoming General Election.In an interview with the Telegraph on Snapchat, the Foreign Secretary attacked Corbyn, who he previously described as a ‘mutton-headed old mugwump’, as a shock poll shows the Tory lead has been cut from 17 to just one point. On the prospect of Corbyn leading Brexit negotiations, he added: “The thing that most alarms me is that we have a big decision to make about how to get Brexit right. He doesn’t seem to have a clue about how he wants to conduct the negotiations or indeed what he really wants.“If he were to get in he would only survive if he were propped up on either side by the Scottish nationalists or the Lib Dems. Both of them jabbering in his ear. They both want to frustrate Brexit.”The Telegraph has joined Snapchat! Stay up-to-date with all the election news using the snapcode below: Asked to sum up Corbyn in less than 30 words, Johnson quipped he was: “A Chavez-admiring curiously-vested leader of a sleeper cell of crypto-communists who piratically captured the Labour Party.”The former Mayor of London added he would be “deeply ashamed” if Corbyn was elected Prime Minister on June 8.Asked how he would feel, Johnson replied: “Deeply shocked. I will feel deeply ashamed. Because I will feel we have somehow failed to explain the risk and that will be my fault.” He added that in his lifetime, “we’ve never had a leader of the Labour Party who is so left wing”.“I think young people genuinely do not remember the 1970s and the 1980s in the way that some of us do. Labour was very left wing then, in the 1970s things went totally off the rails,” he said. “All the stuff Corbyn is talking about is not new, people think it’s new, this isn’t new. We had this- it was a disaster. Nationalisation- we’ve done all that- it doesn’t work. It’s called left wing socialism.” Theresa May is hoping for election victory Credit:AFP Or by clicking here from your mobile device. Johnson also criticised the Labour leader’s admiration for Venezuela’s self-styled socialist revolutionary Hugo Chavez’s politics and mocked Corbyn’s fondness of wearing a vest.He also joked the Labour Party is full of secret communists ready to turn their backs on capitalism should they win the election. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings.