The High Court of Australia announced on Friday that the deputy prime minister should be removed from parliament as he held dual citizenship when elected, violating the country’s constitution.

Australia’s constitution bars dual citizens from sitting in parliament, in a section aimed at ensuring MPs do not hold split loyalties.

Prime Minister Malcolm Turnbull would lose his one-seat majority after Deputy Prime Minister Barnaby Joyce was found ineligible.

Six other politicians - Fiona Nash, Matt Canavan, Malcolm Roberts, Nick Xenophon, Larissa Waters and Scott Ludlam - were also referred to the court over their dual citizenship status.