LIVE UPDATES: Prime Minister John Key and Opposition leader Phil Goff are squaring off in a head-to-head debate in Christchurch, a city still seeking answers after a succession of devastating earthquakes.

Pike River, Christchurch and the Rena disaster were the focus of the first leaders' debate last night, which also became mired in a heated exchange about whether John Key was a "liar". So how did Labour leader Phil Goff perform?

At National's election campaign launch, John Key said the proceeds from partial asset sales would be placed in a fund for future investments such as schools, hospitals, and transport projects.