2017 New Democratic Party leadership election
In 2017, the New Democratic Party held a leadership election to choose a successor to Tom Mulcair. The election was triggered by Mulcair having lost a leadership review at the party's federal convention held in Edmonton, Alberta, on April 10, 2016, which resulted in a majority of delegates voting in favour of holding a new leadership election.
Source: Wikipedia — 2017 New Democratic Party leadership election (CC BY-SA 4.0)