Donald Trump will pursue the death penalty for Nancy Guthrie's kidnappers if they do not release her unharmed.

In a call on Tuesday (Monday US time), the US president said the person or people who took Nancy will face "very, very severe – the most severe" penalties if she is killed.

When asked if the Department of Justice (DOJ) would request the death penalty, Trump responded: "The most, yeah – that's true."

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Nancy, 84, is the mother of US TV host Savannah Guthrie.

She was last seen at her Arizona home on January 31 and was reported missing the following day when she didn't show up to church.

On January 4, Trump called Savannah to offer federal support in the search for her mother.

The FBI subsequently revealed haunting images and footage of a masked person standing at Nancy's front door.

The figure appears to be a man wearing gloves, long sleeves, pants, and a balaclava.

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A glove appearing to match the footage from Nancy's home was later found around three kilometres away and has been sent for DNA testing.

Local law enforcement investigating her abduction have confirmed multiple sources have issues demands for ransom.

They did not say if any of the demands are considered credible, nor are they aware of any ongoing communication between the alleged kidnappers and Nancy's family.

The Guthrie family was also ruled out as suspects amid 'cruel' speculation.

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Trump's public commentary on the case has been limited.

His declaration that the DOJ will pursue the death penalty if Nancy's abductors harm her is consistent with other high-profile criminal cases in the US.

Robert Bowers, who is responsible for the Tree of Life Synagogue shooting in 2018, was sentenced to death, as was American mass murderer Dylann Roof.

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Opposition Leader Angus Taylor has unveiled his new shadow ministry, bringing back the Nationals and exiled members.

The new leader said his frontbench marked a "fresh beginning" for the Coalition after a tumultuous few weeks that saw the Nationals briefly split from the Liberals, a leadership spill and Sussan Ley ousted from her role.

"This is a team that is blending proven experience with the next generation of Coalition talent," he said. 

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Taylor said he has brought back the Nationals after they mass quit in protest of Ley refusing to reinstate three sacked members.

He said it was an opportunity to put the past behind them and start anew with "unity".

The deputy leader, Jane Hume, has been chosen the shadow minister for employment and industrial relations, and shadow minister for productivity and deregulation portfolios.

She was also named the deputy Liberal leader in the Senate.

Ted O'Brien, the former deputy leader under Ley, has been appointed the new shadow foreign affairs minister.

Tim Wilson was appointed the shadow treasurer.

Andrew Hastie and Jacinta Nampjinpa Price, who were both exiled from the frontbench under Ley, have been promoted.

Hastie, who was rumoured to be a contender for the party leadership but did not run, was named the industry and sovereign capability spokesman and the deputy Liberal leader in the House of Representatives.

Price has been tasked as the spokeswoman for small business, skills and training.

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James Paterson, an outspoken supporter of Taylor in his bid for Liberal leadership, has been given the defence portfolio previously held by Taylor. 

Claire Chandler has been elevated as the new shadow finance minister. 

Sarah Henderson has also returned to the shadow cabinet for the communications and digital safety portfolio.

Michaelia Cash has been appointed the new shadow attorney-general, replacing one of Ley's main supporters Andrew Wallace, and will remain the Leader in the Senate.

Andrew Bragg, another key backer of Ley, remains as the shadow housing and homelessness minister and was also given the shadow environment portfolio.

Nationals members Bridget McKenzie, Susan McDonald and Ross Cadell have returned to the shadow cabinet after they were dumped by Ley for breaking shadow cabinet solidarity rules and voting against the party line on the government's hate laws in January.

Their sacking prompted a mass resignation of the entire Nationals frontbench, which saw the Coalition split for the second time in under a year. 

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Julian Leeser, Melissa McIntosh, Dan Tehan, Dave Sharma, Anne Ruston, Aaron Violi, Henry Pike, Tony Pasin, Leah Blyth, Garth Hamilton, James McGrath and Simon Kennedy were also appointed to the shadow cabinet.

Taylor thanked the outgoing members of the shadow ministry for their service.

"We are fortunate to have talent in our party room and are committed to drawing all of it," he said.

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A father who disappeared from Melbourne almost 14 years ago is now believed to have met with foul play.

Brendan Breen was reported missing when he cancelled dinner with his separated wife via text message in May 2012 but there were some doubts about whether he'd left on his own accord until he missed his own daughter's funeral four years later.

Police this morning renewed their appeal for information about his disappearance, saying what happened remained a mystery.

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Missing persons squad Inspector Dave Dunstan said suspicions were heightened when Breen failed to show up at the October 18 funeral, describing it as the "catalyst" for his squad to get involved.

"While 14 years have passed, we strongly believe there are still people out there who know what has happened to Brendan, who is involved and why this has happened," he said in  a statement,

"Even the smallest detail could be what leads us to a breakthrough and hopefully, puts us in a position to give Brendan's family some answers."

Police said Breen – also known as Brendan Green, Brian Greer and Brendan Lacombe – had previously been charged with fraud offences and spent "several years" in jail.

"There are a number of aspects about his disappearance that continue to give us cause for concern, especially the length of time he has been missing with no trace whatsoever," Dunstan said.

"We know he had a number of associates who were also known to police, and while they have been spoken to over the years, this remains an active avenue of enquiry for investigators."

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Breen, who was 55 at the time, was last seen in Melbourne on April 12, 2012, and the cancelled dinner was on May 9 that same year.

Police said they were still on good terms and she became concerned when he cancelled at the last minute with a text and then stopped answering her calls.

They appealed for help to find the man but said it didn't turn up any new leads.

"Despite a number of enquiries over the next few years, Brendan could not be located," police said.

"In October 2018, Brendan failed to appear at his daughter's funeral and his family believed this to be out of character as the pair were close.

"The matter was reviewed and detectives now believe Brendan's disappearance is suspicious, and he has most likely met with foul play.

"His bank accounts and phone have never been accessed, and there has never been any reported sightings of Brendan."

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Banks Peninsula has been hit by a deluge.

Tractors used to clear part of a road near Taihape affected by fallen trees and slips.

Fire authorities and communities are bracing for peak fire conditions in the coming hours as a south-westerly wind change threatens to impact a volatile bushfire burning in central Victoria.

A bushfire that ignited around 1pm on the Goulburn Valley Highway in Trawool, between Seymour and Yea, has grown throughout the afternoon.

It is currently burning in a south-westerly direction towards Strath Creek, but a wind change expected in the next two hours could shift the flames in a north-easterly direction.

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"It took off very rapidly and [has] taken hold. It's nearly 100 hectares and continues to move quite rapidly," CFA chief officer Jason Heffernan said.

"We are expecting, in the next couple of hours, for that frontal system to come through and a real gusty change will be affecting that fire ground, which will further push it to the east.

Crews are relying on several aerial assets including a water bombing helicopter to smother the flames with water from above.

"There is property already in the path of this fire and there will be further private property after the change, when the fire will change direction."

Heffernan warned communities in the vicinity of the Trawool fire to expect further emergency warnings as the frontal system moves across the state.

"The real peak time of concern for us this evening will be between that six o'clock to eight o'clock mark," he said.

"That's when we'll see the bulk of the change come through, affecting that fireground at Trawool.

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"They should see wind gusts potentially up to 55 to even 60 km/ph… so that will be a concern as that frontal system moves through."

Residents in large parts of Kerrisdale, Tallarook and Trawool have been urged that it is too late and to take shelter indoors immediately.

Those to the north and east of the Goulburn Valley Highway, in parts of Granite, Kerrisdale, Trawool, Dairy Creek and Homewood are not under direct threat, but should stay informed.

"There is currently no threat to you, but you should stay informed and plan for what you will do if the situation changes," the CFA said.

The potential fire impact zone has since been extended to other parts of Kerrisdale, Reedy Creek, Strath Creek and Tallarook, where residents along King Parrot Creek Road and surrounds from Tehans Road to Strath Creek Road have been told to evacuate immediately.

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King Parrot Creek Road is closed from the Goulburn Valley Highway to the Broadford-Flowerdale Road.

The Trawool fire is positioned about 20km from the western fringe of the deadly Longwood blaze that claimed hundreds of homes and one life last month.

"It's the same terrain, the same vegetation, country, as the Longwood fire was burning in," Heffernan said.

Elsewhere, a grassfire that burned along a major road in Melbourne's western suburbs this afternoon has been deemed suspicious by police.

Flames burned through grassland in front of Costco on Ballarat Road near the Western Ring Road in Ardeer around 3.30pm.

Fire crews extinguished the blaze, which has since been deemed suspicious, police said.

Despite a large amount of smoke and visible flames along the ring road, there was no threat to the community.

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Fire authorities yesterday warned of elevated fire danger across the state today, spurred on by hot, dry and windy conditions and dry fuel.

A Total Fire Ban is in place across five fire districts today, amid extreme fire danger ratings.

Those districts include the South West, Wimmera, Central, North Central and West and South Gippsland. 

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The family of an 85-year-old Sydney grandfather kidnapped in a case of mistaken identity have spoken publicly, sharing their devastation and pain.

Chris Baghsarian was taken from his North Ryde home on Friday morning by at least two masked intruders, with one also driving a getaway car that was found burnt out in a nearby suburb.

Police believe Baghsarian was not the intended target and was taken by mistake, but also have grave fears for his safety after a video of him covered and bound was seen. He also requires daily medication, his family says.

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In a statement released this evening by police, Baghsarian's family said they were "living through a nightmare" and were struggling to come to terms with what had happened to the widower.

"Chris's kidnapping feels surreal, and we are struggling to make sense of the fact that he has been taken and that our family has been caught up in something that has nothing to do with us," they said.

"Chris is a devoted father, brother, uncle, and grandfather. He is deeply loved, gentle, and the kindest person we know – someone who would never hurt a fly."

Police said the family had not received a ransom demand and had no links to criminal activity.

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The family asked for privacy during a difficult time.

"As we wait for some form of closure or resolution, we ask for privacy and respectfully request that the media stop publishing photos of our extended family," they said.

"This is an extraordinarily distressing time, and we need space to support one another and focus on navigating what comes next."

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A shopkeeper has been hospitalised after being hit on the head with a hammer in a broad daylight jewellery heist that spanned two stores across Melbourne.

Three offenders armed with hammers and bats entered Official Berwick Jewellers on High Street in Berwick about 12pm today.

The thieves, wearing black hoods, masks and hi-vis shirts, smashed glass cabinets and swept jewellery into bags while a female shopkeeper watched on in horror.

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"I was sitting behind the counter and suddenly three people, they came in, and started to break all the windows," shop attendant Basima Goga said.

"They took some stuff, we tried to defend ourselves, but to be honest, it was very, very scary."

A male shopkeeper confronted them and tried to push them out of the store, and he was assaulted as they continued their rampage.

The trio raced out of the store when the male shopkeeper picked up a wrench and ran towards them.

The three males fled the scene in a waiting Toyota Kluger driven by a fourth male.

The male shopkeeper, aged in his 50s, was treated at the scene for upper body injuries and taken to hospital in a stable condition.

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"For his age, it was bad to be honest. It was bad because they took him to emergency now to do CT scan for him as hammer into his head and hand," Goga said.

Police believe the same group then drove across the city to a jewellery store on The Circle in Altona North, where the same stolen Kluger was rammed into the shop's roller door.

They were unable to gain access to the store and fled empty-handed.

Crime scenes have been set up at each of the shops while detectives investigate.

The thieves remain on the run.

Anyone who witnessed the incident, with CCTV/dashcam footage or any information is urged to contact Crime Stoppers on 1800 333 000 or www.crimestoppersvic.com.au

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The legislation is expected to be passed through the House under urgency.

Resident says they complained at least four times about roaming dogs in the area.