John Key's visit to Palmerston North last week was tarred by a group of protesters expressing "disgust" at the controversial Trans-Pacific Partnership Agreement.
The prime minister's visit included a stop off at Palmerston North Girls' High where he spoke of leadership, before heading to Massey University.
His visit was not made public and Massey University's communications advisor James Gardiner said they were asked not to publicise the event until 12pm on the day. "It isn't an official campus visit ... he was asked to come along by one of the young Nats here."
Protesters were present at both sites carrying flags and signs, while several police officers and campus security watched closely.
Activist Cherylee Bishop led a series of chants and shouted at the prime minister, "this is what democracy sounds like".