The editor of Wikileaks, Kristinn Hrafnsson, has expressed fears that the US could file more serious charges against Assange, and that if he was convicted he could be behind bars for “decades”.
Mr Hrafnsson added that Assange had been thrown “overboard” by Ecuador – and the country was “horrible” to treat him like that.
‘He was a problem’
Meanwhile in Ecuador, President Lenin Moreno criticised Assange, claiming that after spending seven years in the country’s embassy he had dismissed Ecuador by describing it as an insignificant country.
“We had treated him as a guest,” he said. “But not anymore.”
Ecuador’s ambassador to the UK, Jaime Marchan, also previously said Assange had been “continually a problem” while he was living in the embassy.
Meanwhile, a man who is alleged to have links with Assange has been arrested while trying to leave Ecuador, the country’s officials said.
The man – who has been identified by supporters as a Swedish software developer called Ola Bini – had been trying to board a flight to Japan.
The BBC’s diplomatic correspondent James Landale said backing Assange is not without political risk and will not find universal favour among Labour MPs – but Mr Corbyn’s intervention “means the battle over Assange’s future will now be as much political as it is legal”.
The Swedish authorities are now considering whether to reopen an investigation into the allegations of sexual assault, which Assange denies.
The US government has also charged him with allegations of conspiracy to break into a computer, relating to a massive leak of classified US government documents. The UK will decide whether to extradite Assange, and if he was convicted, he could face up to five years in jail.
Shadow home secretary Diane Abbott told BBC Radio 4’s Today programme that “this is all about Wikileaks and all of that embarrassing information about the activities of the American military and security services that was made public”.
But she said Assange should also face the criminal justice system if the Swedish government charged him.
Swedish prosecutors dropped a rape investigation into Assange into 2017because they were unable to formally notify him of the allegations – a necessary step in proceeding with the case – while he remained in the Ecuadorian embassy.