The latest charges accuse him of receiving and unlawfully publishing the names of classified sources, the BBC reported.
Assange is serving a jail sentence in the UK for breaching bail conditions.
The 47-year-old was found guilty last month after his arrest at the Ecuadorian Embassy, where he had sought refuge since 2012 over sexual assault allegations in Sweden. He denies any wrongdoing.
Wikileaks hit back after the announcement, tweeting: "This is madness. It is the end of national security journalism and the first amendment."
Manning was found guilty in 2013 of charges including espionage for leaking secret military files to Wikileaks, but her sentence was commuted.
She is currently back in jail after refusing to testify.
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