Labour leader David Cunliffe has vowed to take Prince William and his family to poorer streets such as McGehan Close and a closed tannery in Shannon.
Last month, British media reported Prince William, the Duchess of Cambridge and Prince George are expected to visit Australia and New Zealand next year, although the royal family has not confirmed it.
In his speech at yesterday's Labour Party conference, Cunliffe said it would be very "convenient" for Key if the royal family visited in an election year.
"Will John Key dare take the Duke and Duchess back to McGehan Close? Will he take them to a closed sawmill in Rotorua or a boarded-up tannery in Shannon?"