The warrant was issued in 2012 after he breached bail conditions by seeking asylum in Ecuador's London embassy - where he has been living ever since.
He had been facing extradition to Sweden to answer sex assault claims but these have since been dropped.
The Crown Prosecution Service says Mr Assange could walk free if he succeeds.
Earlier this month the UK government refused to grant the WikiLeaks founder diplomatic status and called on him to leave the embassy to "face justice".
In April 2017, US attorney general Jeff Sessions said arresting Julian Assange for releasing classified US information was a "priority".
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