Jeremy Corbyn is facing legal actionover his statement in relation to the settlement of the BBC Panorama libel claim.
Mark Lewis, of Patron Law, confirmed he was representing the journalist John Ware in the legal action. Some of the antisemitism whistle-blowers have also joined the action.
Mr Lewis said: “I confirm I have been instructed to pursue cases.”
In a statement on social media on Wednesday, Mr Corbyn said: “The party’s decision to apologise today and make substantial payments to former staff who sued the party in relation to last year’s Panorama programme is a political decision, not a legal one.