A woman was carjacked as she waited outside a laundromat in Melbourne's south-east this morning, with a Good Samaritan who tried to help also being threatened.

The 44-year-old woman from Parkdale was waiting inside her car on Chandler Road in Keysborough at around 6am, when she was ambushed from behind by a thug with a knife.

She was pulled out of the driver's seat, and she was dragged from the car as she attempted to fight back.

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A man ran to try to intervene, but a second person with a knife emerged and threatened him.

The pair then took off in the woman's car.

Witnesses said they were shocked by the speed and intensity of the incident.

"That poor girl was absolutely traumatised," Linda Widdup said.

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"Luckily, there was a young fella up the road, only a little but further up that heard her screaming, and he came running down."

The ordeal lasted less than a minute, but detectives are now trying to piece together exactly what happened, and where the thieves might have gone.

Neither the woman nor the Good Samaritan received any physical injuries, but the victim was shaken up by the experience.

"This poor girl's just gone to do some laundry, and look what's happened," Widdup said.

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Andrew Little said he had been contacted by a senior police officer about Chung’s conduct.

A man is fighting for life after a stabbing in Sydney's north-west.

Emergency services were called to Karril Avenue in Beecroft just after 4.30pm following reports of an assault.

When they arrived, they found a 25-year-old man with stab wounds to his chest.

He was treated at the scene by paramedics and taken to hospital, where was in a critical condition.

More to come.

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National, Labour, NZF, Greens, Act and Opportunity in the year’s first political debate.

SH1 southbound lanes are closed between Pioneer Rd and Great South Rd.

The Finance Minister will make a pre-Budget announcement tomorrow.

The federal government will need the Greens in their corner to pass the tax reform they bet the house on, but the minor party has criticised the changes.

Greens Senator Barbara Pocock said the first day of the inquiry into intergenerational housing inequity has heard that the budget will bake in tax benefits for baby boomers, leaving younger generations locked out.

"The evidence is strong. The gap between generations on housing is very wide. It is not getting narrower," she told reporters at Parliament House today.

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"And the changes that we saw in the budget last week will make a very small difference to that very wide intergenerational gap."

Last week's federal budget proposed grandfathering negative gearing and decreasing the capital gains tax discount as a way to address intergenerational inequity. 

In doing so, Labor broke a key election promise that saw them slump in today's polls. 

"It would surprise me more if we got some sort of bounce in the polls from the difficult decisions we took in the budget," Treasurer Jim Chalmers conceded earlier today.

"We don't hand down budgets expecting to make some kind of big near-term positive difference to an opinion poll five days later, we make these decisions to make a big positive difference to the housing market over time, particularly for young Australians who have been locked up for too long."

Labor's changes will likely sail through the House of Representatives, where they hold the majority, but they will need either the Greens or the Coalition to pass the Senate.

Opposition Leader Angus Taylor has already vowed to fight the changes and, if elected, repeal them.

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The Greens have not yet stated whether they will support the federal government.

Pocock said the Greens will be "taking a very careful look" at the legislation when asked about the minor party's stance.

"We're yet to see the legislation on the capital gains tax discount and negative gearing," she said.

"They are a baby step in the right direction.

"Unfortunately, they preserve benefits for very wealthy property investors and there are a range of things that could've been done which would've limited the locking in of that benefit that's going mostly to baby boomers and really disadvantaging younger people."

The Greens may also use their position to leverage Labor's need for support to push through their own amendments.

The inquiry will hear from Australians across the country over the coming months. 

9news.com.au has contacted the Treasury Department for further comment.

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Their exit follows viral allegations of aggression and unsafe conditions last year.