Barnaby Joyce refers himself to high court over possible New Zealand citizenship

Only one of the guys in the

Deputy prime minister Barnaby Joyce has referred himself to the High Court over the possibility he may be a dual citizen.

Speaking in the House of Representatives this morning, Joyce said he and the government had received legal assurances he is not a dual citizen, and not in violation of Section 44 of the Australian Constitution.

Joyce asked for the matter to be referred to the Australia's high court for a ruling on his eligibility.

Prime Minister Malcolm Turnbull said Mr Joyce should remain as Deputy Prime Minister because the legal advice was so strong.

He will stay on as deputy prime minister. "Neither I, nor my parents have ever had any reason to believe I may be a citizen of any other country", he told parliament.

Joyce was born in Australia.

The New Zealand High Commission contacted Mr Joyce on Thursday afternoon to advise he may be a citizen by descent.

Mr Joyce broke the news in Parliament on Monday, revealing he had been advised he may be a New Zealander by law because of his father's NZ citizenship.

Mr Joyce is the fifth member of parliament to be embroiled in the drama over dual citizenship.

"I was born in Australia in 1967 to an Australian mother".

Greens Senators Scott Ludlam and Larissa Waters were forced to resign after it was revealed they held New Zealand and Canadian citizenship respectively.

The Prime Minister has today written to Opposition Leader Bill Shorten to invite him to "nominate any Labor members of senators whose circumstances may raise questions".

"The Australian people must have confidence in our political system and resolving any uncertainty is vital", he said.

Such a disqualification would threaten the Turnbull Government's one-seat majority in the Lower House.

Liberal Matt Canavan and One Nation's Malcolm Roberts are now waiting on legal advice over their citizenship, with Canavan claiming that his mother applied for Italian citizenship for him without telling him.

'Neither I nor my parents have ever applied to register me as a NZ citizen, and the NZ Government has no register recognising me as a NZ citizen.

Labor frontbencher Anthony Albanese said the party had a "rigorous" process in place for would-be candidates and no one in the caucus had any adverse citizenship issues.