The 40-year-old WikiLeaks founder is wanted by Swedish authorities over sex crimes allegedly committed during a visit to Sweden in 2010.
He has denied any wrongdoing.
A decision from the British high court isn’t expected for another few weeks.
The British court previously approved his extradition, a decision that Assange argues was unlawful.
Last year, the Wikileaks website published thousands of documents from leaked U.S. diplomatic cables, embarrassing a number of governments and angering U.S. authorities.
Assange has suggested that Western governments burned by WikiLeaks are behind his legal troubles.
Compiled from agency reports
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