Judith Collins has been voted in by colleagues as leader of the National Party, with Gerry Brownlee as her deputy.
Todd Muller resigned this morning as National Party leader after less than two months in the role.
In a statement, Muller said he had taken time over the weekend to reflect on his experience over the last several weeks as leader of the opposition.
"The role has taken a heavy toll on me personally, and on my family, and this has become untenable from a health perspective," he said in a statement.
Take a look back at how the day unfolded here: