Turnbull government minister Fiona Nash has been caught up in the dual citizenship fiasco, referring herself to the High Court because of her Scottish descent.
Senator Nash – who is deputy Nationals leader to Barnaby Joyce – revealed in the Senate on Thursday night that she believes she is a dual UK citizen.
Like Mr Joyce, she says she will not stand down from her frontbench positions while the court considers her case.
Senator Nash has a Scottish father, giving her automatic citizenship by descent. She said she was previously assured she did not have it.
It caps a poor week for the Nationals which began with party leader Barnaby Joyce revealing he was a potential victim of the citizenship saga after extensive investigations revealed he inherited dual citizenship through his father, who was born in New Zealand.
In July Senator Mayy Canavan, a dual Italian citizen, quit the ministry and will not vote in the Senate until his case is resolved.
He, too, is a member of the Nationals.
Apart from the three Nationals, two now former Greens Senators Larissa Waters and Scott Ludlam have quit upon discovery they were dual citizens while One National senator Malcolm Roberts is also off to the High Court on the basis he was a dual British citizen when elected.
