Former Newshub political editor Patrick Gower has revealed the worst call he has ever made in his career.

On October 19, 2017, New Zealand First leader Winston Peters announced, as the election's king-maker, that he would form a Government with Labour - ending National's nine years in power.

Peters said keeping National on top would have meant a "modified status quo" versus creating "change" with Labour, who would give capitalism back "its human face".

Gower, Newshub's political editor at the time, said the new Government could be summed up with one word: "Change".

"Change - complete change. The new Government will totally change New Zealand's politics and its economy," Gower wrote in an opinion piece.

But Gower, who admitted he was "excited and hopeful" at the time, has now revealed that that call was the "worst" he has ever made.

"I said that, and then I quit. I quit politics not long after that happened, and thank God I did, because that was blatantly f**king wrong," he said while featuring on the White Man Behind A Desk comedy show.

"I apologise to everyone who saw it and read it, because we see it is patently not true."