The dual citizenship scandal may have ensnared another federal politician, with Nick Xenophon Team MP Rebekha Sharkie revealing the Prime Minister has suggested she may have to refer herself to the High Court.

Ms Sharkie was born in the United Kingdom, but has claimed since the citizenship scandal first broke in July that she had renounced her dual citizenship before she was elected to Parliament.

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In a statement issued this afternoon, Ms Sharkie said the Prime Minister had contacted her about the dual citizenship issue that has plagued the Federal Parliament for months.

"During that conversation the Prime Minister asked me about the dates I sought to renounce my UK citizenship," she said.

The ABC understands the Prime Minister rang Ms Sharkie to discuss the issue of citizenship more generally, and that after Ms Sharkie explained her situation he made the recommendation that she may need to refer her own matter to the High Court.

According to the High Court, any person nominating for federal parliament must be compliant with section 44 of the constitution — which pertains to dual citizenship — before the closing date for nominations.

Ms Sharkie provided a timeline of when she applied to renounce her citizenship, when she was advised it had been received by the UK Home Office and when it was registered.

Timeline of Rebekha Sharkie's dual citizenship: April 19 - Ms Sharkie completed and posted forms to renounce UK citizenship and provided payment to UK Home Office

- Ms Sharkie completed and posted forms to renounce UK citizenship and provided payment to UK Home Office June 2 - Ms Sharkie received acknowledgement that UK Home Office had received application

- Ms Sharkie received acknowledgement that UK Home Office had received application June 7 - Ms Sharkie nominated for seat of Mayo

- Ms Sharkie nominated for seat of Mayo June 9 - Nominations close for 2016 election

- Nominations close for 2016 election June 29 - UK Home Office registered Ms Sharkie's renunciation

- UK Home Office registered Ms Sharkie's renunciation July 2 - Ms Sharkie elected as member for Mayo at federal election

Within that timeline, Ms Sharkie stated that she applied to renounce before the date for nominations closed, but it was not registered until afterwards.

"I believe that I took all steps that were required by the UK to renounce any entitlement to UK citizenship, that were within my power to do so," she said.

"I had no control as to the speed at which the UK Home Office processed my application, but I note that well over a month would have passed before I actually nominated for the seat of Mayo."

Ms Sharkie said she would fully comply with the new citizenship process being finalised by the Prime Minister and Opposition Leader Bill Shorten, but that she was confident she had fulfilled the requirements of the constitution.

"I will, of course, fully and willingly comply with the declaration of citizenship process that will soon be implemented, and if that process determines my case should be referred to the High Court, I will of course respect that," she said.

Her party's former leader, Nick Xenophon, was also caught up in the saga, but the High Court found he was eligible to be elected because the British Overseas Citizenship he was entitled to did not even allow a person to reside in Britain.

He said Ms Sharkie took steps to renounce any entitlements to UK citizenship before the election and should not be judged too quickly.

"I do not believe Rebekha Sharkie was a dual citizen at the time of the election because well before the election, well before the election was even called, she actually took steps to renounce any entitlements to UK citizenship," he said.

"She did the right thing. She filled out the form, she paid the application fee for renunciation and she did that weeks before the Prime Minister even called for the election. She did that back in April of 2016 and the election wasn't called until May 2016.

"It's pretty clear to me under reasonable interpretation that she did all the right things by Section 44 of the Constitution so people should not be quick to judge her, let the Parliament go through its process.

"But right now, this seems to be more of a political storm that has more heat than light in it."

Ms Sharkie's former leader Nick Xenophon was also caught up in the citizenship scandal, but the High Court found he was eligible. ( AAP: Lukas Coch )

'Uncle Sam is definitely not my uncle'

Ms Sharkie's mother was born in the United States and later married her British father in the United Kingdom.

Ms Sharkie has said she was never entitled to any US citizenship because her mother did not live there for long enough to qualify for residency.

"She left the US as a child, lived in England, married in England. My grandparents separated, so at the age of 11, my mother went to live in the UK with all of her sisters," she told ABC Radio Adelaide in an interview on Wednesday.

"Under the US laws, in order for me to get citizenship, she would need to have spent at least two years post her 14th birthday. So it didn't happen.

"Uncle Sam is definitely not my uncle. Actually, one of my cousins in the UK went into the US Embassy to try and get US citizenship, and I think she had a bit of a tanty there and they politely asked her to leave.

"So I definitely know that both US and UK struck off."

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