Liberal frontbencher Paul Fletcher, whose seat is under threat, will retire from federal politics at the next election.
Mr Fletcher, who served as a communications minister in the Morrison government, has represented the Sydney electorate of Bradfield since 2009.
The outgoing MP said it had been a privilege to represent the seat.
“Renewal is healthy, for people and institutions, and now is the right time to hand over the baton,” he said in a statement on Tuesday.
“I will continue to serve my constituents in Bradfield for the balance of this parliamentary term. I will also keep working for the election of a Dutton Liberal government.”
While Bradfield has long been considered a blue-ribbon seat for the Liberals, Mr Fletcher came close to losing it at the 2022 election.
There was a large swing against him, after independent Nicolette Boele entered the race.
The Liberals now hold Bradfield on a margin of 4.2 per cent and Ms Boele has launched a new campaign to win the seat at the federal election due by May next year.
“While we will take nothing for granted in the campaign, the local mood is discernibly different from 2022,” Mr Fletcher said.
“I expect some outstanding people will put themselves forward to be the next Liberal candidate for Bradfield, and to serve the people of Bradfield with energy and commitment.”
Mr Fletcher was first elected to parliament following a by-election in 2009 sparked by the retirement of former opposition leader Brendan Nelson.
After Malcolm Turnbull become prime minister, Mr Fletcher was named minister for territories and local government and later urban infrastructure.
He was a prominent cabinet minister in Scott Morrison’s government, first as social services minister and later leading the communications portfolio.
Mr Fletcher plans to return to the private sector.