She attempted to dismiss new questions over her citizenship on Monday night, and Liberal backbencher Craig Kelly, who called for an audit on the citizenship status of every federal politician on Tuesday, stood by his colleague.

On Monday, The Guardian revealed at the age of 10, her nationality was listed as “British Australian” on an incoming passenger card, filled out when she was re-entering Australia.

Mr Kelly told the South Coast Register that she should undergo the same scrutiny as opposition leader Bill Shorten, also under fire for his British ties.

“For consistency they both should hand themselves to the High Court or wait and see what comes of the hearings in the near future,” he said.

On Tuesday Mrs Sudmalis was unavailable to comment on whether she would refer her case to the High Court.

“My father filled out the incoming passenger card on my behalf in 1966,” Mrs Sudmalis told Fairfax Media.

“He labelled my nationality as British-Australian because of my parentage. I did not travel on a passport of any sort for that trip to Australia.”

She was travelling with her father at the time.

"The explanation she's given makes sense to me,” Mr Kelly said.

“Also, if you look back to 1966, at that time, everyone was considered British-Australian.”

Previous questions – whether she was entitled to citizenship by descent under British law – have not been conclusively answered, and she has not released documents. She has refused to release this information until opposition leader Bill Shorten, also under fire for his British ties, does so.