"The Wikileaks founder Julian Assange is threatening to sue The Guardian for libel after claims in a book published by the newspaper about its collaboration with him.

"The prospect of the defamation action comes as the 39-year-old Australian is due appear in court in south-east London this morning to fight extradition to Sweden, where he is wanted for questioning about allegations of sexual assault against two women. Mr Assange's battle to overturn a European arrest warrant issued by the Swedish authorities will enter a crucial phase at Belmarsh magistrates' court when a judge begins hearing two days of evidence. Mr Assange's lawyers are expected to argue the Swedish prosecutors have incorrectly filed the case and that the proceedings are politically motivated."

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