As the contents of 226 sets of citizenship documents tabled in parliament are digested, both the major parties have politicians facing the High Court in the new year.
The hit list on the Turnbull government benches includes Jason Falinski, Ross Vasta, Nola Marino, Julia Banks, Alex Hawke, Michael McCormack and potentially cabinet minister Josh Frydenberg and Senator Arthur Sinodinos.
While Labor's list includes David Feeney, Justine Keay, Susan Lamb and Josh Wilson as well as Katy Gallagher in the Senate.
Nick Xenophon Team MP Rebekha Sharkie's eligibility is also in doubt.
Mr Feeney will ask to be referred to the High Court if documents confirming UK authorities received his citizenship renunciation does not show up in the next few days.
He is among four Labor MPs to be caught up in the dual citizenship saga after parliament's citizenship register was made public on Tuesday.
Attorney-General George Brandis has accused some Labor MPs of hiding in plain sight amid questions over their eligibility to sit in parliament.
"Now we know that there are four of their MPs and one of their senators who basically have been trying to hide in plain sight over the last couple of months while this saga has been brewing," Senator Brandis told Nine Network on Wednesday.
The citizenship and family history details of 150 lower house MPs were tabled in parliament, a day after the details of their 76 Senate colleagues were released.
Mr Feeney said he lodged renunciation papers in 2007 but had been unable to find any records of them.
"On this basis, if the relevant documents have not been located by the time this issue has been dealt with in the House of Representatives, I will be asking the manager of opposition business to refer this matter to the High Court," he told parliament.
In his declaration, Mr Feeney said he signed documents prepared for him in October 2007 on the steps he needed to renounce any inherited British citizenship.
"As far as I am aware those documents were sent to the relevant British and Irish authorities as required at the time," he wrote.
"In November 2017, I sought confirmation from the Irish ambassador about my renunciation of any Irish citizenship I may have had in 2007. Further inquiries are being made of the Irish embassy to confirm receipt of my renunciation of any entitlement of Irish citizenship."
Three other Labor MPs did not receive confirmation their British citizenship was renounced until after the close of candidate nominations for the 2016 Federal Election.
Through a new citizenship disclosure regime enforced by the federal government, it has been revealed Labor's Justine Keay completed the form renouncing her citizenship in May last year.
But the documents were not received by the UK Home Office until June 16 last year and not registered until July 11. The close of nominations for candidates was June 9.
Ms Keay has been under a dual citizenship cloud for several weeks amid pressure from the Turnbull government to clarify her status.
She also tabled legal advice which said she had satisfied all the legal requirements for renouncing British citizenship when she mailed her completed form.
Longman MP Susan Lamb, whose father was born in Scotland, filled out her renunciation form on May 24 and the Home Office processed payment on June 6, three days before the close of nominations.
However, the Home Office sought further information on July 7, which she provided, and on August 10 the British bureaucracy told her: "We cannot be satisfied from the documents available that you hold British citizenship. The application has therefore been refused."
Ms Lamb also released legal advice which stated she had taken all necessary steps to renounce her citizenship when she sent her form on May 25.
West Australian Labor MP Josh Wilson did not receive his confirmation from British authorities of his renunciation until June 24.
Mr Wilson, who was born in London, sent the forms on May 12 last year.
In his declaration, Mr Wilson said he took all necessary steps to renounce his citizenship.
Whose citizenship is still being questioned?
Jason Falinski: NSW Liberal MP
Liberal MP Jason Falinski in his declaration said he was confident he was not a Polish citizen through descent but did not provide any letters of confirmation.
Mr Falinski has sought further legal advice after being unable to ascertain whether his USSR-born father, Polish and British born grandfathers, and Leningrad-born grandmother conferred foreign citizenship on him.
He wrote on his citizenship declaration form lodged with parliament on Tuesday he had made inquiries of both the Polish consulate and UK High Commission, and searched "archival material".
"I have further sought legal advice ... to confirm my citizenship status solely as an Australian citizen," he wrote.
Rebekha Sharkie: South Australian Nick Xenophon MP
Nick Xenophon Team MP Rebekha Sharkie renounced her British ties on April 19 last year but did not get confirmation until June 29 after nominations closed.
Katy Gallagher: ACT Labor senator
In the upper house, the Turnbull government is weighing up whether to seek Greens and crossbench support in the Senate to refer Labor senator Katy Gallagher to the court over her UK dual citizenship.
Senator Gallagher, the former ACT chief minister, did not receive confirmation of her UK citizenship renunciation until two months after nominations closed for the 2016 federal election and 118 days after she lodged the application.
The Greens party room on Tuesday agreed to support "bona fide referrals", but not any partisan warfare.
Josh Frydenberg: Victorian Liberal MP
Questions remain over cabinet minister Josh Frydenberg citizenship status after he made his disclosure to parliament.
The Environment Minister's declaration, published on Tuesday, states his mother was born in Hungary's capital Budapest and her parents are both Hungarian.
His grandparents on his father's side were born in Poland.
Mr Frydenberg insists he has not been a citizen of a foreign county
He said he had retrieved documents about the citizenship of parents and grandparents from available family sources and sought legal advice from citizenship law experts from Hungary and Poland, and Australia.
Mr Frydenberg has previously dismissed as absurd, claims he inherited Hungarian citizenship from his mother who was stateless when she fled the country "which would have pushed them into the gas chambers".
- Additional reporting by Natasha Christian and AAP
