Ardern later ran for the Labour nomination for the Mount Albert by-election to be held in February 2017. The by-election was held because of the resignation of David Shearer. When nominations for the Labour Party closed on 12 January 2017, Ardern was the only nominee and was selected. On 21 January, Ardern took part of the 2017 Women's March, a worldwide protest in opposition to Donald Trump, the newly inaugurated President of the United States. She was confirmed as Labour's candidate at a meeting on 22 January. Ardern won a landslide victory, winning 77 per cent of votes cast in the preliminary results.