National Party of Australia leadership elections

The leader of the National Party of Australia (former the Australian Country Party and National Country Party) is elected by majority vote of the federal parliamentary party. A deputy leader is elected in the same fashion. The party's longest-serving leader is Earle Page, who held the office from 1921 to 1939. It is historically rare for the incumbent leader and deputy leader to be opposed in a bid for re-election.
2016.
On 11 February 2016, National Party leader, Warren Truss announced his intention to retire at the 2016 federal election would immediately stand aside as Leader of The Nationals. Truss's deputy Barnaby Joyce, was elected unopposed as Truss' replacement, with Fiona Nash as his deputy. Consequently, Joyce was then sworn in as Deputy Prime Minister of Australia on 18 February 2016.
2018.
On 26 February 2018, the Nationals held a party room meeting at which Barnaby Joyce formally resigned to the backbench. Michael McCormack was seen as the favourite to become leader, and was the only declared candidate as at 25 February. At the meeting he secured the support of a majority of the 21 National Party parliamentarians, seeing off a last-minute challenge from Queensland MP George Christensen.