Veteran left-wing MP Jeremy Corbyn received the warmest welcome of all the candidates at a Labour leadership campaign hustings.
All three of his rivals were booed and heckled on the issue of renewing Trident, and for refusing to condemn Tory welfare reforms.
Jeremy Corbyn, who scraped through to the next round of the Labour leadership contest just two minutes before the deadline, has said that his success marks the launch of a "broader anti-austerity movement".
Hailing the role social media played in his campaign, he said: "We secured these nominations as a result of a massive campaign across the country by Labour supporters urging Labour MPs to allow for a wide-ranging democratic debate within our party.
"My candidacy marks the launch of a broader anti-austerity movement to shift the terms of political debate in this country by presenting an alternative to the socially devastating and widely discredited austerity agenda."
But not everyone is happy: Labour backbencher John Mann was scathing on Twitter.
"So to demonstrate our desire never to win again, Islington's Jeremy Corbyn is now a Labour leadership candidate," he said.
The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.