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The Greens will continue to push for extra support for households and businesses ahead of proposed energy relief measures being debated in parliament.

The federal government wants parliament to support a 12-month gas price cap of $12 per gigajoule and a temporary coal price cap of $125 a tonne.

The proposed laws would also set up mandatory "gas market codes" to regulate the supply and purchase of gas.

But it will need the votes of either the coalition or the Greens plus one crossbencher to get the new laws through the Senate.

Prime Minister Anthony Albanese, who has been isolating in Sydney after testing positive to COVID-19 last week, is expected to return to Canberra on Wednesday as he looks to secure support from the Greens and crossbench.

Greens leader Adam Bandt will push for a two-year freeze on power bills and support for businesses and households to replace gas appliances.

Mr Bandt said this could be funded by a windfall tax on coal and gas corporations.

"We want to see more money in people's pockets paid for by making the big coal and gas corporations pay their fair share of tax," he told reporters on Tuesday.

"We want to have some further discussions with the government about the level of support that's going to be provided to people because we're worried that people are going to wind up doing it tough."

Mr Bandt admitted negotiating did not mean everyone got what they wanted, but he was hopeful his talks with the prime minister would result in positive changes to the proposal.

"Does everyone in these discussions end up getting everything they want? Not always," he said.

"Are we able to do something that means people get a bit more money in their pocket than they otherwise would have, and help people reduce their power bills in the long term? I think that's within reach."

He said the minor party does not want to stand in the way of energy relief and was approaching discussions with the government in good faith.

Parliament will meet on Thursday for a special sitting to debate and pass the relief measures before Christmas.

© AAP 2022

Queensland police will investigate whether two murdered officers were lured to a rural property by killers with links to extremist online communities.

Constables Matthew Arnold, 26, and Rachel McCrow, 29, along with 58-year-old resident Alan Dare were gunned down in Wieambilla, in the western Darling Downs region, on Monday evening.

Their killers - former school principal Nathaniel Train, his brother Gareth and sister-in-law Stacey - died in a firefight with heavily armed tactical officers later that night.

Another two constables who were called to the property - 28-year-olds Keeley Brough and Randall Kirk - managed to escape.

Queensland Police Commissioner Katarina Carroll said investigators would look at the killers' possible extremist links after a series of posts under the name of Gareth Train were uncovered on conspiracy theory forums.

The posts include references to anti-vaccine sentiments and claims high-profile shootings were hoaxes or false-flag operations.

"It's very difficult at the moment for us to reason with what has happened, there are no obvious reasons," Ms Carroll told ABC's 7.30 program on Tuesday night.

"But within the next few days and the next few weeks, I have no doubt that we will come back ... (with) some insight into what we believe took place."

Ms Carroll said every possible motivation for the killings was being looked at, including whether it was a premeditated attack on the officers.

"Some of the stuff that's online from these people, we will investigate what they have been doing not only in recent weeks but in recent years, who they've been interacting with ... their online presence, every aspect of this will be thorough," she said.

The police commissioner described the deadly shooting as "senseless and callous".

Prime Minister Anthony Albanese echoed her sentiments as he paid tribute to the slain constables and Mr Dare.

"This is not a price that anyone who puts on the uniform should ever pay. We can never count the true cost," he said on Tuesday.

"My heart goes out to the families and loved ones of all those affected by this tragedy. With honour they served, and Australia mourns with you."

© AAP 2022

Former prime minister Scott Morrison will appear at a royal commission into the failed robodebt scheme on Wednesday.

The commission is attempting to establish why the changes to welfare debt protocol were adopted, despite concerns over their legality.

Mr Morrison was involved with implementing the scheme in 2015, when he was social services minister.

Records show Mr Morrison signed a department document that included the concerns, which were absent when the policy was later presented to cabinet for consideration.

Between 2015 and 2020 the scheme wrongly recovered more than $750 million from 381,000 people, with several victims taking their lives while being pursued for the false debts.

Former foreign minister Marise Payne appeared as a witness before the commission on Tuesday.

Senator Payne was human services minister at the time the program was formulated and oversaw the creation of department briefings for Mr Morrison, who was her senior minister.

She said she had no knowledge of why the legal issues flagged in earlier briefings were omitted from the final policy proposal.

"How did the identification of the problem ... drop off the radar by the time it seems (cabinet) considered the proposal?" senior counsel assisting Justin Greggery KC asked Senator Payne.

"I don't know the answer to that question and I say that in all transparency," she said.

"There is an expectation, however, that when agencies advise you, on the face of a brief, that they are working together to address these issues."

When asked who held responsibility for advancing the concerns, Senator Payne said ministers were always "ultimately responsible" but must receive advice from their departments.

© AAP 2022