A protester stands outside the Royal Courts of Justice in...

A protester stands outside the Royal Courts of Justice in London, Wednesday, Feb. 21, 2024. Julian Assange's lawyers are on their final U.K. legal challenge to stop the WikiLeaks founder from being sent to the United States to face spying charges. The 52-year-old has been fighting extradition for more than a decade, including seven years in self-exile in the Ecuadorian Embassy in London and the last five years in a high-security prison. Credit: AP/Kin Cheung

LONDON — WikiLeaks founder Julian Assange won't find out until next month at the earliest whether he can challenge extradition to the U.S. on spying charges, or if his long legal battle in Britain has run out of road.

Two High Court judges said Wednesday they would take time to consider their verdict after a two-day hearing in which Assange's lawyers argued sending him to the United States would risk a “flagrant denial of justice."

Attorneys for the U.S., where Assange has been indicted on espionage charges, said he put innocent lives at risk and went beyond journalism in his bid to solicit, steal and indiscriminately publish classified U.S. government documents.

Assange’s lawyers asked the High Court to grant him a new appeal — his last roll of the legal dice in the saga that has kept him in a British high-security prison for the past five years.

The judges overseeing the case reserved their decision, and a ruling on Assange's future is not expected until March at the earliest.

If judges Victoria Sharp and Jeremy Johnson rule against Assange, he can ask the European Court of Human Rights to block his extradition — though supporters worry he could be put on a plane to the U.S. before that happens, because the British government has already signed an extradition order.

The 52-year-old Australian has been indicted on 17 charges of espionage and one charge of computer misuse over his website’s publication of a trove of classified U.S. documents almost 15 years ago. American prosecutors allege Assange encouraged and helped U.S. Army intelligence analyst Chelsea Manning steal diplomatic cables and military files that WikiLeaks published, putting lives at risk.

Stella Assange wife of Julian Assange leaves at lunchtime the...

Stella Assange wife of Julian Assange leaves at lunchtime the Royal Courts of Justice in London, Tuesday, Feb. 20, 2024. WikiLeaks founder Julian Assange will make his final appeal against his impending extradition to the United States at the court. Credit: AP/Kirsty Wigglesworth

Lawyer Clair Dobbin, representing the U.S. government, said Wednesday that Assange damaged U.S. security and intelligence services and “created a grave and imminent risk” by releasing the hundreds of thousands of documents — risks that could harm and lead to the arbitrary detention of innocent people, many of whom lived in war zones or under repressive regimes.

Dobbin added that in encouraging Manning and others to hack into government computers and steal from them, Assange was “going a very considerable way beyond” a journalist gathering information.

Assange was “not someone who has just set up an online box to which people can provide classified information,” she said. “The allegations are that he sought to encourage theft and hacking that would benefit WikiLeaks.”

Assange's supporters maintain he is a secrecy-busting journalist who exposed U.S. military wrongdoing in Iraq and Afghanistan. They have long argued that the prosecution is politically motivated and he won’t get a fair trial in the U.S.

A demonstrator holds a Julian Assange mask outside the Royal...

A demonstrator holds a Julian Assange mask outside the Royal Courts of Justice in London, Tuesday, Feb. 20, 2024. Julian Assange’s lawyers will begin their final U.K. legal challenge to stop the WikiLeaks founder from being sent to the United States to face spying charges. The 52-year-old has been fighting extradition for more than a decade, including seven years in self-exile in the Ecuadorian Embassy in London and the last five years in a high-security prison. Credit: AP/Kirsty Wigglesworth

Assange’s lawyers argued on the first day of the hearing on Tuesday that American authorities are seeking to punish him for WikiLeaks’ “exposure of criminality on the part of the U.S. government on an unprecedented scale,” including torture and killings.

Lawyer Edward Fitzgerald said there is "a real risk he may suffer a flagrant denial of justice” if he is sent to the U.S.

Dobbin said the prosecution is based on law and evidence, and has remained consistent despite the changes of government in the U.S. during the legal battle.

She added that the First Amendment does not confer immunity on journalists who break the law. Media outlets that went through the process of redacting the documents before publishing them are not being prosecuted, she said.

Assange’s lawyers say he could face up to 175 years in prison if convicted, though American authorities have said the sentence is likely to be much shorter.

Assange was absent from court on both days because he is unwell, WikiLeaks said. Stella Assange, his wife, said he had wanted to attend, but was “not in good condition.”

Assange’s family and supporters say his physical and mental health have suffered during more than a decade of legal battles, including seven years in self-exile in the Ecuadorian Embassy in London.

“Julian is a political prisoner and he has to be released,” said Stella Assange, who married the WikiLeaks founder in prison in 2022.

“They’re putting Julian into the hands of the country and of the people who plotted his assassination," she added, referring to unproven claims by Assange's lawyers that he was a target of a CIA plot to kidnap or kill him while he was in the Ecuadorian Embassy.

Supporters holding “Free Julian Assange” signs and chanting “there is only one decision — no extradition” protested outside the High Court building for a second day.

Assange’s legal troubles began in 2010, when he was arrested in London at the request of Sweden, which wanted to question him about allegations of rape and sexual assault made by two women. In 2012, Assange jumped bail and sought refuge inside the Ecuadorian Embassy.

The relationship between Assange and his hosts eventually soured, and he was evicted from the embassy in April 2019. British police immediately arrested and imprisoned him for breaching bail in 2012. Sweden dropped the sex crimes investigations in November 2019 because so much time had elapsed.

A U.K. district court judge rejected the U.S. extradition request in 2021 on the grounds that Assange was likely to kill himself if held under harsh U.S. prison conditions. Higher courts overturned that decision after getting assurances from the U.S. about his treatment. The British government signed an extradition order in June 2022.

Meanwhile, the Australian parliament last week called for Assange to be allowed to return to his homeland.

Andrew Wilkie, an Australian lawmaker who attended the hearing, said he hoped that sent a strong message to the U.K. and U.S. governments to end the legal fight. “This has gone on long enough,” he said.

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