![Nick Xenophon leads a crucial bloc of senators in Parliament.](http://web.archive.org./web/20170819063519im_/https://www.fairfaxstatic.com.au/content/dam/images/g/t/7/e/m/1/image.related.square.80x75.gxzu0g.2f8s9.png/1503124263908.jpg)
![Barnaby Joyce is the fifth federal MP to be referred to the High Court over their citizenship status in the past month.](http://web.archive.org./web/20170819063519im_/https://www.fairfaxstatic.com.au/content/dam/images/g/x/x/j/o/3/image.related.square.80x75.gxyr25.11wz9w.png/1503118770404.jpg)
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