Labor questions if Joyce and Nash can make legally valid decisions as ministers

As Barnaby Joyce and Fiona Nash face high court cases over citizenship, the constitution says parliamentarians cannot be ministers if not validly elected

Labor has opened a new front in the Turnbull government's citizenship crisis, raising the prospect that ministers may be unable to validly execute their ministerial duties under the constitution while there is a question about whether they have been validly elected.

Stephen Jones, the shadow minister for regional communications, wrote to the prime minister, Malcolm Turnbull, on Friday, demanding that he ask the deputy Nationals leader, Fiona Nash, to stand aside while her case is before the high court.