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The 48-year-old Australian citizen has repeatedly denied the allegation against him, made in 2010.
Assange was initially charged with conspiring with Manning to gain access to a government computer as part of a 2010 leak by WikiLeaks of hundreds of thousands of US military reports about the wars in Afghanistan and Iraq.
Assange, who denies the accusation, was arrested in London last month after spending seven years inside the Ecuadorean embassy.
The United States is also seeking his extradition on conspiracy charges relating to the public release by Wikileaks of a cache of secret documents, including assessments of foreign leaders, wars and security matters.
To some, Assange is a hero for exposing what supporters cast as abuse of power by modern states and for championing free speech. But to others, he is a dangerous rebel who has undermined US Security.
Assange has been holed up in a back room of the Ecuador embassy in central London for nearly seven years now for fear of being extradited to the US, where he faces a possible death sentence or torture for Wikileaks' alleged leak of secrets.