Prince Philip has carried out his last public engagement.

The 96-year-old has bowed out of public duty, at the Captain General's parade of the Royal Marines.

SEE ALSO: Prince Philip, Duke of Edinburgh through the years

UK Correspondent Rod Liddle told Mike Hosking he has done over 22,000 engagements by himself since 1952.

He said it marks a break with the old school of royals.

"The people who keep a stiff upper lip ... and a very rude to foreigners when they get the chance. And the new school of royals, who like to share their emotional incontinence with the world."

Liddle is referring to a documentary that aired recently, featuring Princes William and Harry revealing how they felt after their mother's death.

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What's in a political slogan?

That's the question Labour's new leadership is mulling over as it pieces together its rebooted election battle plan.

Under Andrew Little, it was "A Fresh Approach" - but that's going to be getting a refresh itself.

Auckland University marketing professor Bodo Lang told Mike Hosking the campaign semantics are very important.

"It does encapsulate where the party stands on views, and I think we have very much a mixed bag at the moment.

"If I look at National's slogan for example - 'Delivering for New Zealanders' - I think it's a fantastic slogan if you're a logistics company."

Dr Lang said Labour's old slogan would have been great if people weren't happy with the status quo under National, but that hasn't been the case.

"I think Jacinda Ardern is doing the right thing [by replacing the slogan], and I think it's almost a symbolic move really."

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Mike Hosking looks back at past interviews and comments by Jacinda Ardern, to figure out whether she has actually ever wanted to be the Prime Minister of New Zealand.

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Donations to the Labour Party have increased significantly in the past few hours, as voters throw their support behind Jacinda Ardern.

The newly appointed leader appears to have been widely embraced, following the exit of Andrew Little.

Labour Party general secretary Andrew Kirton told Mike Hosking around $100,000 was donated to the party yesterday.

He said at one point, supporters were donating $700 a minute.

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Labour's new deputy leader Kelvin Davis says since Jacinda Ardern replaced Andrew Little as Labour leader yesterday, they've had an "amazing response", with over $110,000 donated online.

Davis speaks with Mike Hosking.

SEE ALSO: Jacinda Ardern: 'We need to lift our game'

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Jacinda Ardern's under no illusions about her party's performance.

The Labour leader's been on the job for less than a day, after Andrew Little's surprise resignation.

Mr Little stood down after polling showed the party at 24 percent of the vote, and the leadership change is hoped to lift that.

Ms Ardern told Mike Hosking she's not setting a target for how much she wants to lift Labour in the polls.

"Ultimately, when you're in opposition politics the goal is to be in government. What we do absolutely need to do though is lift our game. That's clear, that's clear to everyone. I don't think anyone would dispute that."

Ms Ardern said she's taking the next few days to look over the state of the campaign, before making any changes.

She said she wants to improve on Labour's strong platforms for the issues of health, housing, and education.

"What I'll be looking for is just a couple of areas in there to put a bit of emphasis on things that I think people will be wanting to hear, a bit more vision and hope for the future."

LISTEN ABOVE AS LABOUR LEADER JACINDA ARDERN SPEAKS TO MIKE HOSKING

How many 'close' friends do you think you have? 10? 15? 20?

Turns out it's way less than that, it's only three to five.

Does that surprise you? Why would the number be so low?

Associate professor of psychology at Auckland University, Nickola Overall, speaks with Mike Hosking.

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Andrew Little has gone to ground this morning amid speculation over his leadership.

A Labour caucus meeting is just hours away.

Mr Little has cancelled all scheduled media appointments this morning, just minutes before he was due to appear on television.

Massey University political scientist Grant Duncan told Mike Hosking said Mr Little simply hasn't managed to connect with voters.

"Andrew hasn't really been firing on all cylinders unfortunately, even though he's a good guy, he hasn't really been cutting through."

Duncan said a change in leadership this close to the election could hurt the party even more.

"Because that obviously shows disunity and instability and so-forth. It may just be that what's happening here in the long term is just a gradual demise of the Labour party."

LISTEN ABOVE AS GRANT DUNCAN SPEAKS WITH MIKE HOSKING

After just 10 days on the job, Anthony Scaramucci's gone.

The White House communications director has been removed from his role, after an expletive-laden interview with The New Yorker hit headlines last week.

Mr Scaramucci had the White House chief of staff Reince Preibus removed from his role.

He was then sacked by Preibus' replacement, John Kelly.

US correspondent Nick Bryant told Mike Hosking it's hoped Kelly will bring some stability to the White House.

"You wonder whether this is the bottoming out, things will improve from here, but there's just no way of telling. It's such a chaotic and unpredictable White House."

Bryant said the constant White House shuffle is being compared to reality TV.

"Oh the scriptwriters have gone bonkers. It revives that old joke from last year that it's the final season of America, and the scriptwriters have just gone crazy."

LISTEN ABOVE AS NICK BRYANT SPEAKS TO MIKE HOSKING

A sudden change of course for Andrew Little just hours ahead of what could be a caucus showdown.

The Labour leader has cancelled all his interviews this morning. A spokesman says his focus needs to be on his caucus.

It comes after disastrous poll results putting Labour at its worst ever rating, just weeks before the election.

Political editor Barry Soper told Mike Hosking it's up to Mr Little himself to decide if his leadership should face a vote.

And if someone like deputy Jacinda Ardern puts her hand up, others will too.

"So you'll see Grant Robertson, Phil Twyford and Stuart Nash - it'll be all over the place, it'll be a dogs breakfast if they decide to change the leader. It's entirely over to Andrew Little, he's got to make the decision.

"The caucus can change the leader today quite easily. My view is if one puts up their hand, like Jacinda Ardern for example, and she's got no appetite for it, then others will follow suit."

LISTEN ABOVE AS POLITICAL EDITOR BARRY SOPER SPEAKS WITH MIKE HOSKING