Labor national secretary Noah Carroll has announced his resignation as the party seeks to work out what went wrong in the federal election campaign and how to rebuild.
Mr Carroll has been the party's national secretary and key campaign strategist since September 2016, having been central to Labor's successful 2014 state election campaign in Victoria.
He told members of the ALP national executive at a meeting in Canberra on Friday he would take personal leave before a resignation date was set.
Assistant secretary Paul Erickson will temporarily take on the role, and is considered a potential successor.
"Noah Carroll has been a very hard-working national secretary," Labor leader Anthony Albanese said after the meeting.
"He's diligent, he's committed and I'm sure the next step in his life he will be successful at whatever he decides to do."
The executive also decided on a panel to review the Labor campaign.
It will be headed by former South Australian premier Jay Weatherill and former federal minister Craig Emerson, and involve Labor figures Linda White, Anthony Chisholm, John Graham and Lenda Oshalem.
"It is important to examine what has happened in the past - you've got to know where you've been to know where you are going," Mr Albanese said of the review.
"It's critical we examine the campaign while it is still fresh in peoples' minds, have a look at some of the data, have a look at the campaign strategy."
It would also examine the accuracy of polling, which has been widely criticised.
The executive will receive the report in October.
Dr Emerson hails from Queensland, which was ground zero for Labor's loss.
Former Labor leader Bill Shorten told colleagues after the May 18 election powerful vested interests were to blame for the coalition being returned.
"We were up against corporate leviathans, a financial behemoth, spending unprecedented hundreds of millions of dollars advertising, telling lies, spreading fear - they got what they wanted," he told the caucus.
Labor national president Wayne Swan told the ABC days after the election he wanted to see an "honest, thorough examination of what went wrong".
Labor has 68 seats in the lower house, down one on its previous position.
Nationwide, Labor received 33.34 per cent of the primary vote - a 1.4 per cent swing against the opposition party - while the coalition received 41.4 per cent.
