WELLINGTON, Aug 12 (Reuters) - New Zealand Prime Minister Christopher Luxon survived a confidence vote on Wednesday, seeing off a leadership challenge from his defence minister that exposed growing rifts in his National Party less than three months before a tight election.
The bid by Chris Penk was the year's second public test for Luxon, boosting concern over disquiet in his centre-right party as it struggles in opinion polls and fuelling fresh doubts about his grip on power ahead of the November 7 election.
Luxon moved swiftly after the vote, sacking Penk from his defence, intelligence, space and building portfolios. The prime minister said Penk had instigated the leadership challenge, leaving his position "untenable".
Penk later said he would quit politics and not contest his seat at the election, but said he supported Luxon to lead the government. He did not respond to a request for comment.
Luxon called National's caucus meeting after media reports that party members were canvassing support for a leadership change.
He emerged flanked by senior ministers including Erica Stanford and Chris Bishop and delivered a 75-second statement before leaving without taking questions.
"There was a confidence vote in my leadership this morning at our caucus meeting and I have the full support of our caucus," Luxon said.
The vote secured Luxon's position for now, but it was his second confidence ballot since April - a rare public airing of leadership tensions in New Zealand politics, where such disputes are usually handled behind closed doors.
Luxon's leadership drew fresh scrutiny after a series of public missteps.
These included floating the idea of a possible referendum on New Zealand's electoral system without consulting colleagues, and an appeal to a business audience to "be adult" rather than seeking government help.
As the economy sputters, the 56-year-old former Air New Zealand chief executive has struggled to improve National's standing and his own popularity.
A 1News Verian poll published on Wednesday put Luxon's preferred-prime-minister rating at 17%, down 1 percentage point. He remained ahead of Labour Party leader Chris Hipkins, whose rating slipped one point to 15%.
But survival alone would not erase the damage, said political commentator Neale Jones, a former Labour Party staffer.
"This further undermines his authority as prime minister and as leader, and does make it harder for National," Jones said.
Labour's "worst-case scenario" would have been National replacing Luxon and gaining an opportunity to reset its campaign before the election, Jones added.
AMBITIOUS AGENDA FALTERS
Luxon took over National in late 2021 and became prime minister in 2023, when the party formed a coalition government with the libertarian ACT Party and New Zealand First.
A millionaire father of two with several properties, Luxon has at times struggled to connect with voters, critics say, particularly when he lapses into corporate rhetoric.
His government has pursued an ambitious reform agenda, including planning and water reforms, tax cuts, tighter public spending, higher defence spending and a more active foreign policy.
It has also strengthened two-way ties, such as a free trade pact with India.
Yet the economy remains the defining political battleground.
Luxon won office promising to tame inflation and rein in debt, but growth remains weak, unemployment is at an 11-year high and inflation is outside the central bank's 1% to 3% target range.
Most polls show National narrowly trailing Labour, though the complexities of New Zealand's electoral system leave the November contest too close to call.
The 1News Verian poll showed support for Labour was down 2 points from June to 30% while National's vote stayed at 29%.
Former National lawmaker Simon O'Connor said the party could recover from the damage, but it needed to focus on policy and the campaign.
"National cannot have any more distractions like this and the troublemakers either need to be encouraged or pushed to the side," he said. "They cannot have any more days like this."
(Reporting by Lucy Craymer in Wellington and Alasdair Pal in Sydney; Editing by Jamie Freed and Shri Navaratnam)
