Prime Minister John Key made a fleeting visit to Dunedin this morning, just four days out from the general election.

He visited Silver Fern Farms, then fronted a media stand-up about surveillance.

Key addressed the current allegations of mass surveillance and spying, brought to the fore by opponent Kim Dotcom.

Key rubbished Dotcom's claims as nothing but rhetoric, and maintains that ordinary New Zealanders are not being spied on.

From Dunedin he travelled on to Christchurch.