The High Court in London has allowed the US to challenge a psychiatric evaluation of Julian Assange, which was key in an earlier court ruling refusing Washington’s request to extradite him for trial.

Wednesday’s appeal proceeding is the latest development in the continuing effort by the US to extradite Assange to stand trial on American soil for alleged computer-related crimes.

District Judge Vanessa Baraitser refused in January to grant a request from Washington for Assange to face trial in the US on spying charges, ruling he was at serious risk of death by suicide.