The mother of WikiLeaks founder Julian Assange says she is increasing pressure on the Federal Government to take up her son's case.

A hearing is underway in London to determine whether Mr Assange should be extradited to Sweden to face sexual misconduct allegations.

On Tuesday, retired Swedish appeals court judge Brita Sundberg-Weitman told Mr Assange's London extradition hearing that Swedish prosecutor Marianne Ny had a "rather biased view against men" and seemed to want to make Mr Assange "suffer".

Christine Assange says she will highlight the injustices of her son's case outside the office of Foreign Affairs Minister Kevin Rudd in Brisbane tomorrow.

"The European arrest warrant - the normal protocols are that it's only issued when someone has already been charged to bring them back to the country for trial," she said.

"She [Ny] has issued it on the grounds she wants to interview him.

"This has breached his legal and human rights and all police protocols."

Mr Assange denies the allegations against him.

His lawyers say his extradition to Sweden could be a stepping stone to extradition to the United States, where they say he could end up facing execution for leaking secrets.

Ms Assange says her son is getting enormous support from his home state of Queensland.

"It just seems to be part of the Queensland psyche to help when people are having troubles, as you've seen in the floods and the cyclones," she said.

"To stand alongside their fellow Australians and they're not frightened to speak out, all good qualities."

Mr Assange has been free under strict conditions since a British court released him on bail in December.

The US government is examining whether criminal charges can be brought against him over the leaked diplomatic cables published by his WikiLeaks website.