Other members of the party, which has vowe d to closely scrutinise any government in power, have also walked away, including four of its 11 governing National Council representatives.

Assange, who has been holed up in the Ecuadoran embassy in London for more than a year fighting extradition to Sweden where he is wanted for questioning over sexual assault claims, admitted he had not been as focused as he should have.

“I made a decision two months ago to spend a lot of my time on dealing with the Edward Snowden asylum situation and trying to save the life of a young man (Bradley Manning),” he told the Australian Broadcasting Corporation.

“Now, the result is over-delegation, so I admit and I accept full responsibility for over-delegating functions to the Australian party while I tried to take care of those situations.