Jacinda Ardern and Kelvin Davis have been elected unopposed at a caucus meeting as Labour's new leader and deputy.

Andrew Little stepped aside as Labour leader this morning and endorsed Ms Ardern as his replacement.

Key events:

On Sunday, Labour drops 3 points to 24 percent in a 1 News Colmar Brunton poll, its lowest in more than 20 years

Leader Andrew Little reveals he had discussed the option of resigning with senior colleages but they had wanted him to stay on

Mr Little tells RNZ's Morning Report on Monday morning he is "absolutely determined" to be the Labour leader. However he concedes, "at 24 [percent], you don't get to form a government".

Andrew Little resigns, an hour after telling RNZ's reporter he had no intention of doing so

See how it all went down with RNZ's updates here: