WikiLeaks founder Julian Assange is poised to learn whether a British judge has approved his extradition to the United States to face charges including espionage over the release of secret military documents.

US authorities accuse the Australian-born 49-year-old of 18 counts of conspiring to hack government computers and releasing vast troves of confidential military records and diplomatic cables over a decade ago.

If extradited and then found guilty of espionage, Assange could go to prison for 30 to 40 years, his lawyers say, though prosecutors say he would face no more than 63 months in jail.

Whoever loses Monday’s ruling is likely to appeal to London’s High Court and the case could go the United Kingdom’s Supreme Court, further delaying the final outcome.

US prosecutors and Western security officials see Assange, the founder of WikiLeaks, as a reckless and dangerous enemy of the state whose actions put at risk the lives of agents whose names were in the material.

Supporters regard him as an anti-establishment hero victimised because he exposed US wrongdoing in wars in Afghanistan and Iraq and say his prosecution is an assault on journalism and free speech.

Tweet from @wikileaks

Assange’s legal team said in its closing written submission to Judge Vanessa Baraitser the prosecution had been politically motivated “during a unique period of US history under the Trump administration.”

The legal team representing the United States has challenged that assertion, saying US federal prosecutors are forbidden to consider political opinion in making decisions.

WikiLeaks published a US military video in 2010 showing a 2007 attack by Apache helicopters in Baghdad that killed a dozen people. It then released thousands of secret classified files and diplomatic cables.

The legal saga began soon after when Sweden sought Assange’s extradition from Britain over allegations of sex crimes.

When he lost that case in 2012, he fled to the Ecuadorean embassy in London, where he spent seven years, during which he fathered two children.

When he was finally dragged out in April 2019, he was jailed for breaching British bail conditions although the Swedish case against him had been dropped.

Last June, the US Justice Department formally asked Britain to extradite him.

Assange’s lawyers say the charges are politically motivated, his mental health is at risk, conditions in US prisons breach Britain’s human rights laws and he was spied on while in the Ecuadorean embassy.

The US legal team has said many of Assange’s defence arguments are issues that should be addressed in a trial and have no bearing on extradition.

There is also a possibility Joe Biden might reverse the decision to prosecute Assange after Biden succeeds Trump as president later this month.