In the latest of a series of referrals to the High Court, cabinet minister Fiona Nash and crossbench senator Nick Xenophon have both been formally referred to the High Court over citizenship questions.
Meanwhile, with a stint acting as prime minister looming while Malcolm Turnbull visits Samoa, Deputy Prime Minister and Agriculture Minister Barnaby Joyce is insisting he has the right to remain in his positions while his eligibility remains in doubt.
"I've said right at the start, if the Solicitor General's advice had been that we were less than likely of course I would have. But otherwise I would have stood down, gone to a by-election and people would have said, 'Why are you doing this when the Solicitor General's advice said you were going to be right?'"
He is one of seven parliamentarians to have been referred to the High Court over the issue of citizenship, which also includes former cabinet minister Matt Canavan, One Nation's Malcolm Roberts and two former Greens senators.
Mr Joyce was advised last month that because his father was born in New Zealand, he is therefore a New Zealand citizen by descent.
Outside parliament, former Prime Minister Tony Abbott defended Mr Joyce while brandishing a letter from the British government, showing he renounced UK citizenship in 1993.
He challenged Federal Opposition leader Bill Shorten to do the same.
"Bill Shorten is in exactly the same position as Barnaby Joyce. His father was born overseas. He says he's renounced his British citizenship, well show it or shut up. And if you can't show it, then he should let the Deputy Prime Minister and the government get on with the job of governing this country."
And so Mr Shorten did, tabling documents in parliament from the UK authorities proving he renounced his citizenship prior to being elected in 2007.
"I offer this proof to the parliament today to put an end to baseless allegations, not reward them. I strongly believe that MPs and Senators should not be forced to produce evidence to counter claims that are made completely without evidence."
Later this week, Mr Joyce is expected to fill the position of Acting Prime Minister while the Prime Minister attends the Pacific Islands Forum in Samoa.
But Labor argues there's no way the Nationals leader should be acting prime minister while his eligibility is in doubt.
Manager of Opposition Business in the House of Representatives, Tony Burke.
"We will continue to fight for the fact that the constitution of Australia ought to be sufficiently respected that if we don't know whether or not somebody is legally allowed to be there, we don't make them deputy prime minister."
Labor is threatening to disrupt business in the lower house until the Nationals leader steps down from cabinet, or the court makes its ruling.
Greens leader Richard Di Natale says not only are the citizenship sagas an unnecessary distraction, but they undermine the public's faith in the democratic process.
"What we need now is a full and comprehensive audit of every member of this parliament so that this farce does not continue and so that we get on with the business of governing and doing the things that we are elected to do."
The High Court will hear the dual citizenship cases over three days from October the 10th.
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