THE man who set in motion the Australian citizenship scandal that has now claimed five political careers says he expects more heads will roll.

West Australian Lawyer John Cameron outed Greens MP Scott Ludlam as a New Zealand citizen in July this year, leading to an eventual constitutional crisis for the Australian government.

Senator Ludlam's resignation resulted in the status of numerous other politicians being questioned, which culminated in Friday's High Court Decision disqualifying five federal MPs.

In months that followed Senator Ludlam's resignation Mr Cameron has kept his silence, but following the court's decision has explained to AAP his motivation to dig into the background of Australia's representatives.

The scandal began after John Cameron ousted Greens MP Scott Ludlam (pictured) as a New Zealand citizen in July this year. Picture: AAP/Lukas Coch
The scandal began after John Cameron ousted Greens MP Scott Ludlam (pictured) as a New Zealand citizen in July this year. Picture: AAP/Lukas Coch

Mr Cameron, who voted for Senator Ludlam, applied with the New Zealand Internal Affairs Department to search their register for the Greens senator, and found he was in fact a citizen.

From there he contacted the Australian Senate alerting them to the fact the he was a dual citizen, before contacting Senator Ludlam's office.

While Mr Cameron said he was "invariably surprised" at how quickly the citizenship scandal had snowballed, he expects more politicians will fall foul of section 44 of the Australian constitution in coming months.

"There will be others," Mr Cameron told AAP, just hours after the Australian High Court disqualified Mr Joyce and four other MPs on Friday afternoon.

"This opens up a huge can of worms," he said from Perth.

The High Court’s decision on Friday has left Prime Minister Malcolm Turnbull’s government in crisis. Picture: AAP/Lukas Coch
The High Court’s decision on Friday has left Prime Minister Malcolm Turnbull’s government in crisis. Picture: AAP/Lukas Coch

Mr Cameron said that of the additional MPs he expected would lose their jobs, many would be British citizens.

- Read the High Court's judgment in full here -

While not religious, Mr Cameron said a prayer was his principal motivation to pursue to the citizenship story: "God, grant me the serenity to accept the things I cannot change, courage to change the things I can and wisdom to know the difference". Mr Cameron said the prayer motivated him to make sure he would change what he could.

"There are those in Parliament who think that they are above the law. A correction is required," he said.

The Perth based lawyer said he began digging in 2011, starting with then Prime Minister Julia Gillard and opposition leader Tony Abbott.

Former Deputy PM Barnaby Joyce begins his re-election campaign talking locals at a pub in Tamworth. Picture: Lyndon Mechielsen/The Australian
Former Deputy PM Barnaby Joyce begins his re-election campaign talking locals at a pub in Tamworth. Picture: Lyndon Mechielsen/The Australian

"When I started I was after Gillard and Abbott but I wasn't having much joy getting the evidence; or I wasn't getting much joy in the high court accepting the evidence that I had from the British border authority," he said. Instead Mr Cameron turned to his home country of New Zealand for information and the "low lying fruit" that was Senator Ludlam.

"So it was easier to go after Scott Ludlam as one of the low lying fruit because it was accessible through New Zealand," he said.

Former One Nation Senator Malcolm Roberts holds a press conference at Parliament House in Canberra on Friday after the High Court handed down its decision. Picture: AAP Image/Lukas Coch
Former One Nation Senator Malcolm Roberts holds a press conference at Parliament House in Canberra on Friday after the High Court handed down its decision. Picture: AAP Image/Lukas Coch

Five months later, Mr Joyce, Senator Ludlam, Nationals MP Fiona Nash, One Nation Senator Malcolm Roberts and Greens Greens MP Larissa Waters have all been booted from office.

Mr Cameron said the citizenship scandal highlighted a need for a national anti- corruption commission, similar to what has been established in NSW.

"There's a crying out need for an independent commission on corruption, as this case has demonstrated," he said.

"And if nothing else comes out then it will have been worthwhile."



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