An inquiry into the events surrounding Judith Collins' downfall will not examine the relationship between her and Whale Oil blogger Cameron Slater, says John Key.

Judith Collins is depicted in alleged conversations discussing the leak of evidence in a high profile case to blogger Cam Slater - but she says they're forgeries.

Power bills have been rising relentlessly. The two sides of politics are divided on house best to rein that in - competition or regulation.

An inquiry into the release of a sensitive security document to Cameron Slater within days of requesting it will include access to computer systems, documents and phone records.

The hacker known as Rawshark has released information purporting to be social media conversations and emails between Judith Collins and Cameron Slater.

Former SFO boss Adam Feeley says he hopes the police are considering a criminal investigation into claims Judith Collins was linked to a smear campaign against him.

Former SFO boss Adam Feeley says he would not have briefed ministers on investigations if he had had any suspicion that information was being leaked to others.

Prime Minister John Key said he believed his campaign was still on track, despite the "bomb" that has been thrown since the release of Dirty Politics.

Mai Chen writes: When Judith Collins resigned on Saturday, she asked the Prime Minister to hold an inquiry so she could clear her name.

The job of a Minister of Justice is to protect the integrity of the system and any sign of political interference risks infecting the whole system, writes Josie Pagani.

In the latest in this Herald election series, we look at the main parties' policies on tax and the economy - and what it could mean for you.

John Key has tried to distance himself from claims Mark Hotchin was paying bloggers to undermine the SFO, saying he does not know about the arrangement.

Nation, I'm bored. And not just because I watched this week's leaders' debate, but mainly for that reason.

Labour leader David Cunliffe says all ministers should be subject to a full commission of inquiry to get to the bottom of Dirty Politics.

Allegations levelled against former Justice Minister Judith Collins have been described as extremely concerning by the State Services Commissioner.

In Winston's World, John Key is a voodoo doll he stabs with a pin whenever he gets bored.

One of Judith Collins’ most relentless opponents, Joe Karam, says the country is better off with her out of Cabinet.

When the Wallabies drew with the All Blacks in the first Bledisloe Cup match in Sydney, it was widely considered almost as good as a win.

Whale Oil blogger Cameron Slater is backing his mate Judith Collins.

Judith Collins says her decision to quit will allow Prime Minister John Key to focus on the election campaign.

Judith Collins has resigned, effective immediately.

New Zealand First leader Winston Peters says Judith Collins' credibility is in tatters and her accusations of lying about a plot to potentially roll Prime Minister John Key are hollow.

An inquiry into Transport Minister Gerry Brownlee and his deliberate breach of airport security is unlikely to be completed before the election.

Auckland's home affordability headache won't be solved in a hurry but both National and Labour now have quick fixes for desperate home buyers.

More than 14,000 Herald Online readers have had their say on tonight’s leaders debate - clicking on our “buzzdial” more than 2.6 million times.

The economy, housing and foreign investment featured while Dirty Politics barely came up in the leaders' debate last night.

NZ Herald commentators deliver their verdicts on who won the first leaders' debate between John Key and David Cunliffe.