The New South Wales Nationals say their process for ensuring the eligibility of candidates for Parliament is "onerous," but it has been beefed up in the weeks since the dual citizenship debacle first hit Australian members and senators, but the Victorian Nationals have not asked candidates if they are dual citizens before nominating.

The announcement by deputy Nationals leader Fiona Nash last night that she holds British citizenship through descent as well as Australian citizenship comes after the revelation earlier this week that Deputy Prime Minister and leader of the Nationals in Parliament Barnaby Joyce holds New Zealand citizenship, also through descent.