ℍ𝕖𝕣𝕣 ℂ𝕠𝕝𝕝𝕚𝕟𝕤 𝕣𝕖𝕗𝕦𝕤𝕖𝕤 𝕥𝕠 𝕔𝕠𝕟𝕗𝕚𝕣𝕞 𝕔𝕒𝕦𝕔𝕦𝕤 𝕡𝕦𝕣𝕘𝕖 𝕒𝕗𝕥𝕖𝕣 𝕋𝕠𝕕𝕕 𝕄𝕦𝕝𝕝𝕖𝕣 𝕣𝕖𝕤𝕚𝕘𝕟𝕒𝕥𝕚𝕠𝕟. 𝕃𝕦𝕩𝕠𝕟 𝕟𝕠𝕥 𝕣𝕦𝕝𝕚𝕟𝕘 𝕠𝕦𝕥 ℕ𝕒𝕥𝕚𝕠𝕟𝕒𝕝 ℙ𝕒𝕣𝕥𝕪 𝕝𝕖𝕒𝕕𝕖𝕣𝕤𝕙𝕚𝕡 𝕓𝕚𝕕.

𝕆𝕡𝕡𝕠𝕤𝕚𝕥𝕚𝕠𝕟 𝕡𝕒𝕣𝕥𝕪 𝔽𝕦𝕙𝕣𝕖𝕣 ℂ𝕙𝕦𝕔𝕜𝕪 ℂ𝕠𝕝𝕝𝕚𝕟𝕤 𝕚𝕤 𝕣𝕖𝕗𝕦𝕤𝕚𝕟𝕘 𝕥𝕠 𝕤𝕒𝕪 𝕨𝕙𝕖𝕥𝕙𝕖𝕣 𝕤𝕙𝕖'𝕤 𝕡𝕦𝕣𝕘𝕚𝕟𝕘 𝕝𝕖𝕒𝕜𝕖𝕣𝕤 𝕗𝕣𝕠𝕞 𝕙𝕖𝕣 𝕔𝕒𝕦𝕔𝕦𝕤 𝕒𝕗𝕥𝕖𝕣 𝕋𝕠𝕕𝕕 𝕄𝕦𝕝𝕝𝕖𝕣 𝕨𝕒𝕤 𝕗𝕠𝕣𝕔𝕖𝕕 𝕥𝕠 𝕣𝕖𝕤𝕚𝕘𝕟 𝕗𝕠𝕣 𝕓𝕒𝕔𝕜𝕤𝕥𝕒𝕓𝕓𝕚𝕟𝕘 𝕒 𝕗𝕖𝕝𝕝𝕠𝕨 ℕ𝕒𝕥𝕚𝕠𝕟𝕒𝕝 𝕄ℙ 𝕥𝕠 𝕥𝕙𝕖 𝕞𝕖𝕕𝕚𝕒.

Collins' MPs seem to have got the message for now but leadership hopeful Christopher Luxon still isn't ruling out a tilt at her job.

Leaks from National's caucus have been cauterised, made clear by effectively ousting Muller for leaking. 

"I don't think leaking is the right thing to do and the leader has made that clear," former leader Simon Bridges said on Tuesday. 

But Collins won't say if she's purging the leakers.

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"I'm focused on the things that matter."

Collins has sent the mother of all warning shots to her caucus to focus. 

"I'm making that very clear," she said on Tuesday. "When you talk about things like leaks in caucus, those are matters for me to deal with."

But Collins doesn't view her leadership as becoming more ruthless. 

"Oh, I think that's such a harsh term."

Last week Collins called a late night caucus meeting. She won't say if she gave Muller an ultimatum to resign or be booted from caucus. 

"Well I can't possibly do that, can I?"

Muller backstabbed returned MP Harete Hipango to media over whether she used taxpayer money to buy furniture.

The newly returned National MP wouldn't be drawn on the issue on Tuesday.

"I'll just say that it's good to be back," she said. "We're going to move on with that, as I say the matter's been dealt with appropriately by Parliamentary Services."

In an apparent case of amateur hour, Muller reportedly did his trash talking of Hipango in front of another MP - Barbara Kuriger. But Kuriger also wouldn't confirm what happened. 

"It's a caucus matter. It's a matter for caucus and that's all I have to say, thank you," Kuriger said as she walked off. 

Collins' handling of Muller has been savaged by her former chief press secretary Janet Wilson, who has called it "paranoid head-rolling".

But Collins laughs in the face of paranoia.

"What do you think?" she laughed. "Of course not."

Though she may have good reason to be paranoid. Leadership hopeful Christopher Luxon, the former CEO of Air New Zealand, is still very hopeful.

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"Judith's doing an amazing job, she's doing an awesome job, I'm fully supportive of her, I found her very good to work with," he said on Tuesday. 

But he wouldn't rule out a tilt at the leadership. 

"I'll be honest, I've come in new, I've got lots to learn."

This is Collins' most cutthroat attempt at putting an end to National's seemingly endless exercise in self-destruction.

The problem for her is Muller wasn't the first National MP to speak out of school, nor will he be the last. 

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