The High Court will in October hear the cases of politicians accused of having dual citizenship which may make them ineligible to hold elected office in Australia.

Chief Justice Susan Kiefel set three days from 10 October in Canberra after lawyers for One Nation Senator Malcolm Roberts successfully persuaded the court that they needed more time to prepare.

Seven current and former senators and MPs appear to have run afoul of section 44(i) of the constitution, which disqualifies people from serving in parliament if they are "under any acknowledgment of allegiance, obedience, or adherence to a foreign power, or is a subject or a citizen or entitled to the rights or privileges of a subject or a citizen of a foreign power".  The list includes the aforementioned Roberts, plus Deputy Prime Minister Barnaby Joyce, Nationals senator Matt Canavan, and former Greens senators Scott Ludlam and Larissa Waters.  The latter two stood down from the Senate of their own volition.

Each had been made aware that they could still be dual citizens because of where they or their parents were born.  Deputy Nationals leader Fiona Nash and South Australian senator Nick Xenophon's cases were awaiting formal referral to the court.

In the case of Barnaby Joyce, the High Court will allow his greatest political rival to join the citizenship challenge.  Mr. Windsor won his submission because he was the second-placed candidate in the 2016 election for the New England seat - the one he held until his retirement in 2013.