a result of the law change from 9 January 2018. Parliamentary eligibility crisis Members of Turnbull's government were among those embroiled in the parliamentary eligibility crisis that arose in 2017, which disqualified several parliamentarians who held dual citizenship in accordance with subsection 44(i) of the Australian Constitution. Three Cabinet members were among the "Citizenship Seven" whose cases were heard in the High Court of Australia: the leader and deputy leader of the co-governing National Party, Deputy Prime Minister Barnaby Joyce, Senator Fiona Nash, and Resources Minister Matt Canavan, who resigned from Cabinet after discovering his potential dual citizenship. The High Court ruled that Canavan was eligible, but disqualified dual citizens Joyce and Nash from Parliament. The Turnbull government temporarily lost its one-seat majority in the House of Representatives after Joyce's disqualification and the resignation of Liberal Party MP John Alexander, who also held dual citizenship. However, in December 2017 both Joyce and Alexander, having renounced their foreign citizenships, contested and won by-elections in their former seats of New England and Bennelong respectively, thereby retaining Turnbull's governing majority in the House of Representatives. August 2018 leadership spills On 21 August 2018, Turnbull survived a challenge to his leadership of the Liberal Party by Home Affairs Minister Peter Dutton, winning by 48 votes to 35. The spill highlighted ideological tensions within the Liberal Party, between the moderate wing led by Turnbull and the conservative wing represented by Dutton and Tony Abbott. From 21 to 23 August, tensions mounted and Dutton announced that he would seek a second spill. Turnbull responded that, pending a report from the Solicitor-General of Australia on the eligibility of Dutton to serve in Parliament and the receipt of a petition calling for a party room meeting that bore the signatures of at least half (43) of the parliamentary party, he would call such a meeting, vacate the leadership (regarding the petition as a vote of no confidence) and not stand in the subsequent leadership election. On the morning of 24 August, the Solicitor-General advised that Peter Dutton was "not ineligible" to serve. Later that morning, Dutton presented to Turnbull a document calling for a party room meeting that contained the minimum 43 signatures. A party meeting was then called and the leadership was spilled, with Scott Morrison elected as Turnbull's successor by 45 votes over Dutton with 40. In his final press conference as Prime Minister, Turnbull denounced