Lawyers for WikiLeaks founder Julian Assange said Friday that he might face charges in the United States related to the Espionage Act, ABC News reported. His lawyers are preparing for a possible indictment.

Attorney Jennifer Robinson said: "Our position of course is that we don't believe it applies to Mr. Assange and that in any event he's entitled to First Amendment protection as publisher of Wikileaks and any prosecution under the Espionage Act would in my view be unconstitutional and puts at risk all media organizations in the U.S."

Assange is currently in police custody after turning himself in to U.K. Police on Tuesday for sex-related charges. Robinson said he is in solitary confinement, with restricted to access to phones and to his attorneys.

British authorities plan to extradite him to Sweden where he would face "one count of unlawful coercion, two counts of sexual molestation and one count of rape allegedly committed in August 2010." Assange has denied those charges.

Read more from ABC News here.