Barnaby Joyce, Fiona Nash, Malcolm Roberts: in the citizenship challenge, the court was… not so high on your eligibility.

Three anti-marriage equality politicians have been ruled ineligible to serve in Federal Parliament today as the High Court handed down its rulings in the Citizenship Seven case.

Joyce, the Deputy Prime Minister and leader of the Nationals, will have to re-contest his seat of New England at a by-election in December as a result of not properly renouncing his New Zealand citizenship.

Meanwhile, Deputy Leader of the Nationals and NSW Senator Fiona Nash will also be required to leave the Upper House.

Larissa Waters and Scott Ludlam, Greens Senators who had previously resigned from their positions over citizenship doubts, were also ruled ineligible.

One Nation has also lost some of its sway as colourful Queensland Senator Malcolm Roberts has also been given the boot.

Independent South Australian Senator Nick Xenophon, who is leaving the federal stage for state politics, and Queensland LNP Senator Matt Canavan were ruled eligible to continue to serve.

The High Court’s ruling was unanimous in all cases, and throws the Turnbull government into further turmoil with the government no longer holding its small majority.

Joyce is a storied opponent of marriage equality, though he recently said he would not vote against it should the postal survey return a Yes result.

He suffered a swing against him when Tony Windsor stood against him at the last election.

ABC election analyst Antony Green said today that Joyce remains the favourite to return to his seat, and that “even if Tony Windsor does [stand against him], I would still say Barnaby Joyce is the favourite.”

Nash is also staunchly opposed, having clashed with Magda Szubanski on Q&A over the issue last year.

Roberts spoke in favour of the plebiscite, and was against marriage equality “in accordance with the laws of nature”, and in August used LGBTI rights as a cudgel to criticise Islam.

He will reportedly stand for One Nation in the safe Labor seat of Ipswich at the next Queensland state election.

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