Radio New Zealand National presenter Sean Plunket handed in his resignation today, after more than a decade at the state-owned network.
Plunket has co-hosted Morning Report since September 1996 and has won numerous media awards for his work.
Radio NZ head of news Don Rood says it is with great regret that he announces Plunket's resignation.
His last day at RNZ will be September 8.
Morning Report enjoys ratings success as the country's most popular breakfast radio show, Rood says. He says Plunket has been a big part of that success.
"I wish him all the best."
Plunket has threatened to resign a number of times in the past.
His latest run in with Radio NZ went through the Employment Relations Authority, where the broadcaster won a ruling allowing it to ban Plunket from writing a political column while on the public payroll.
Plunket confirmed at the weekend that he had reached an agreement with RNZ and his first political column would appear in next month's Metro magazine, the Herald on Sunday reported.
Metro editor Simon Wilson says Plunket will be "writing from within the Wellington political scene".
Plunket has also worked in television, including stints on Fair Go, a number of years as TV3 political correspondent in the press gallery and with current affairs show Holmes.