What's next for Barnaby Joyce?

Senator Wong, Labor's foreign affairs spokeswoman, said the party was deeply disappointed that Ms Bishop has been prepared "to risk relations with our close friend and ally".

In Mr Joyce's case, this applies to his father.

Deputy Prime Minister Barnaby Joyce's citizenship fiasco blew out yesterday to a diplomatic stoush with New Zealand.

The issue has turned into a political fight in New Zealand five weeks out from the September 23 election, with NZ prime minister Bill English accusing Hipkins of interfering in Australian politics.

Their grandfather, Lieutenant-colonel John Patrick Joyce, DCM, OBE, of the Royal New Zealand Artillery, served in Gallipoli in World War 1 before rising through the ranks and helping to establish the site for the Waiouru Military Camp before returning to Hampden.

But on Tuesday a number of government ministers implied the New Zealand Labour Party had colluded with the Australian Labor Party to bring down Australia's government.

His case has been referred to the High Court of Australia, who will decide whether or not he must resign.

"New Zealand Minister Peter Dunne has since confirmed it was questions by Fairfax journalists, and not the question on notice, which led to the outing of Mr Joyce as a New Zealand citizen".

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Australian Deputy Prime Minister Barnaby Joyce said on Monday he may not be eligible for parliament after being told he may be a dual citizen of Australia and New Zealand, potentially posing a threat to the conservative government's hold on power.

Pyne said the government would take action to refer any Labor MPs with questionable status to the High Court at the same time as Joyce.

The stars aligned for her to monumentally clap-back to Barney when it was revealed this week that he might have to step down from government because he holds a dual citizenship with New Zealand.

Mr Joyce has meanwhile provided proof he has renounced his New Zealand citizenship, releasing documents by New Zealand's internal affairs department.

The constitution bans MPs from having dual nationality. They had been smuggled in, contravening Australia's biosecurity laws.

Foreign Minister Julie Bishop cast doubt on whether Canberra could work with New Zealand Labour if it won a general election scheduled for next month. If he was serious about resolving uncertainty for the good governance of this country, uncertainties that involve his Members of Parliament and his Senators, then surely he'd raise the question in the Australian Parliament? "Australian media inquiries were", Dunne tweeted on Tuesday.

George Williams, a law expert from the University of NSW, said the only way Joyce could win in the High Court was if it applied a "generous interpretation" of the constitutional requirements. Another two senators, Matt Canavan and Malcolm Roberts, will also have their eligibility decided by the High Court. She called the questions inappropriate.

  • Megan Austin