Assange backs Leave because, as he sees it, David Cameron's government is using EU legislation as an excuse for its own decision-making.
"It launders things to the EU and then claims that it can't do anything about it," he said.
Julian Assange is wanted in Sweden for sexual assault, a charge that he has repeatedly denied. Assange believes that, should he be extradited back to Sweden, he will then be handed over to the US, where he will be quizzed about the activities of WikiLeaks. He found refuge in Ecuadorian embassy in London, where he has stayed for four years already.
"We think here in the United Kingdom that you have a right to a fair trial that includes evidence, judges and charges, but in my case we don't have any of that, and it's not just me," he said.
According to Assange, the British government says it has no choice but to keep the embassy besieged because of demands from Brussels, thanks to the European Arrest Warrant (EAW).
However, he says, the EAW is the responsibility of the former UK Labour government, and Cameron's government prefers to put this responsibility on the EU.
"The UK is bad for the EU," he said, "but also the EU is bad for the UK because it permits a lack of democratic accountability in this country by permitting successive governments in this country to simply say ‘oh, we are forced into doing things because of EU legislation' when it is precisely these governments that have been behind the EU legislation in the first place."
During the interview, Assange also announced some upcoming leaks the involve US presidential hopeful Hillary Clinton and he predicted a "very big year" for the WikiLeaks.