Senator Nick Xenophon is the latest Australian politician caught up in the dual-citizenship scandal.
She is the third Turnbull government minister whose case will be referred to the High Court, along with her boss, Barnaby Joyce, who revealed he had New Zealand citizenship on Monday, and former minister Matt Canavan.
The crossbench senator confirmed on Saturday he was a British overseas citizen by descent as a result of his father emigrating to Australia from a British territory.
It comes after Deputy Nationals Leader Fiona Nash revealed on Friday she was a United Kingdom citizen by descent.
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Xenophon, whose father Theodoros Xenophou is from Cyprus - a British colony until 1960, had been increasingly pulled into Canberra's citizenship fiasco after he joked about his own citizenship status at a Sydney book launch last month.
His mother was born in Greece.
"I'm writing to the UK Home Office and contacting the UK high commission".
Senator Xenophon said the issue was becoming a "train wreck" and required a citizenship audit of all members and senators.
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"It seems that being born in Australia, according to 1948 United Kingdom legislation, makes me a colonial Pom - something that has stunned me and my 86-year-old father".
"The great irony here is that my father left Cyprus in order to escape British colonial rule", the senator said.
Attorney-General George Brandis told a Senate committee on Friday that advice had been received from a British QC at 5.40am on Thursday, and it was passed on to the solicitor-general.
The court will hold a directions hearing in Brisbane on August 24.
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