Live: What's next for Christopher Luxon? Chris Penk sacked after failed National leadership challenge

Prime Minister Christopher Luxon has survived a confidence vote - the second in just four months.On Wednesday afternoon, Luxon confirmed speculation that MP Chris Penk had challenged him for the leadership - this is despite his earlier denial.At a press conference after an urgent Caucus meeting, Luxon said it was united and determined to win the election."Our focus is on National's positive plan to fix the basics and to build the future, so that we realise the incredible potential that sits in this country, and that we set it up for our kids and our grandkids."Luxon was flanked by senior MPs, including Nicola Willis, Mark Mitchell and Chris Bishop. Standing just behind them was Erica Stanford, who was rumoured to be gunning for the top job.With Penk's failed challenge, Luxon said his position was now untenable and he was sacked from his ministerial portfolios. Penk later said he will not stand for re-election in November.Follow the latest in our live blog above.