Tim Soutphommasane's warning is at odds with suggestions from his boss and Attorney-General Christian Porter.
Ring fencing the Australian political system makes no sense when the cash is still flowing in.
Attorney-General has expressed support for changes to the law that would force priests to report suspicions of child sex abuse arising from the confessional.
Attorney-General Christian Porter has said foreign-backed operatives could hack the Australian Electoral Commission or pose as voters in a bid to influence politicians.
Government plays down claims of"threat"to fair byelections
Dispute over whether imminent ballots at risk from foreign powers
The Turnbull government will launch a second round of sweeping changes to limit foreign interference in Australian politics.
Former Family Court chief justice Alastair Nicholson says there has been an"insidious campaign"to undermine the court.