Jeremy Corbyn addressed thousands of supporters in London after finding out his name will be on the ballot paper in Labour's leadership contest.
Corbyn arrived at a fundraising event at the O2 Forum in Kentish Town, north London, on Tuesday evening, after a meeting with the party's ruling committee.
Supporters said Mr Corbyn was defiant and spoke about the upcoming party election.
Andy Gregg, from St Albans, said: "He reaffirmed our faith in the fact that change is possible. He astonished me by how resilient from the attacks from the establishment he was."
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The shadow chancellor earned loud cheers as he launched an foul-mouthed attack on the MPs seeking to replace his friend Corbyn.
The MP for Pontypridd resigned as shadow work and pensions secretary last month in protest at Jeremy Corbyn's leadership.
I now realise that my earlier description of the NEC meeting - as an omni-shambles - was generous.