Former prime minister Malcolm Turnbull has infuriated his own backers by intervening in a Liberal Party preselection stoush and attempting to torpedo his replacement's solution.

Key points: Mr Turnbull said his comments regarding Mr Kelly's preselection were not part of a personal vendetta

Mr Turnbull said his comments regarding Mr Kelly's preselection were not part of a personal vendetta The former PM suggested he thought Mr Kelly would not seek to topple the Government by sitting as an independent

The former PM suggested he thought Mr Kelly would not seek to topple the Government by sitting as an independent Mr Kelly has been described as the "Member for Sky News rather than the Member for Hughes" by another Liberal MP

Prime Minister Scott Morrison, who replaced Mr Turnbull as Liberal leader in August, has directed the New South Wales Liberal Party to endorse all sitting members for the next election, including backbencher Craig Kelly, who has threatened to quit the party if he loses preselection.

Mr Turnbull launched a spectacular intervention in the preselection process of Mr Kelly, urging party officials not to "capitulate" to threats from the conservative MP.

Mr Turnbull has also encouraged Mr Morrison to go to the polls shortly after the long summer break, arguing he and his then treasurer had been planning to call an election for March 2 before Mr Turnbull was ousted from the nation's top job.

The ABC understands Mr Morrison wants to avoid a potentially ugly internal brawl and ensure Mr Kelly stays on the Government benches between now and the election.

MPs first learned of the move on Sunday and those from the moderate faction immediately tried to shut it down, believing it was a "smokescreen" to protect Mr Kelly — an outspoken backbencher and Tony Abbott-ally.

While they worked behind the scenes, Mr Turnbull got wind of the plan, picked up his phone and wrote a series of tweets slamming the proposed move.

"It's not a question of knocking him off, it's a question that the democratic processes of the Liberal Party be allowed to operate," Mr Turnbull told the ABC's RN Breakfast.

"What is being proposed to the State Executive is that the State Executive should reindorse Mr Kelly, so that the Liberal Party members of Hughes do not have the opportunity to have their say.

"We've just had a very long debate in New South Wales, in the Liberal Party, about the importance of democracy and grassroot members' participation.

"In my view, the party should allow the preselection process to take its course, and then Mr Kelly will succeed or not."

As one MP put it, the contribution was "distinctly unhelpful" and almost guaranteed Mr Morrison's plan to endorse all members would succeed.

Another MP accused Mr Turnbull of outright hypocrisy given he saved Mr Kelly, Angus Taylor and Concetta Fierravanti-Wells from preselection challenges in the lead-up to the 2016 election.

"He's saying, 'don't do what I did three years ago'," one Liberal said.

"There's a lot of anger at Malcolm over the way he's handled this."

'The weakest reason not to have a preselection process'

Mr Turnbull suggested he did not believe Mr Kelly would seek to topple the Government by quitting the party and sitting as an independent.

"But assuming that he has made that threat, then that is the worst and the weakest reason not to have a preselection process," he said.

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Mr Turnbull also raised concerns about the Coalition's election prospects, and suggested Mr Morrison should consider going to an early election.

Mr Turnbull said the infighting in Canberra could harm New South Wales Premier Gladys Berejiklian's chances in the state poll, due on March 23.

"My view is that it would be manifestly and in the best prospects of the Morrison Government to go to the polls as soon as it can after the summer break," he argued.

"In fact my intention, and Scott's intention for that matter, prior to my being removed as prime minister was to go to the polls on the second of March.

"That would be exactly three weeks before the New South Wales state election.

"But Morrison has to judge the right timing for an election, but you would understand … that there is a real concern in New South Wales Liberal circles that a very good, outstanding government led by Gladys Berejiklian is going to have its prospects of success diminished because of the brand damage to the Liberal Party caused by the leadership change in August."

Mr Morrison announced last week he would bring forward the 2019 Budget to April 2, paving the way for an election in mid to late May.

The last available weekend for a standard House and half Senate election is May 18.

Mr Turnbull infamously described fellow former prime ministers Kevin Rudd and Tony Abbott as "miserable ghosts", for sniping from the backbench and disrupting the work of their respective governments.

He denies that moniker applies to him, given this latest intervention, because he has retired from politics.

Ministers reluctant to weigh into debate

Attorney-General Christian Porter said discussing Mr Kelly's pre-selection and a March election was "utterly trivial" compared to legislation before the Parliament that would allow law enforcement agencies to gain access to encrypted messages.

He told AM Mr Turnbull's intervention was "not overly helpful" and refused to be drawn further into the debate.

"We've got a bill before the Parliament that would allow for appropriate assistance to government law enforcement agencies in [potential terrorist] circumstances," Mr Porter said.

"There is no more important issue in front of Parliament or the Australian people.

"The issues you've just raised are utterly trivial and insignificant compared to what we are dealing with in a policy sense this week."

Sorry, this video has expired Cormann says Turnbull 'entitled to his own opinion'

Finance Minister Mathias Cormann said it was a matter for the New South Wales Liberal Party and Mr Turnbull was entitled to his view.

"Malcolm Turnbull is a private citizen, he's a member of the Liberal Party in New South Wales and I wish him well," he said.

Mr Cormann said he was aware Mr Turnbull had been considering a March election but was unaware a final decision had been made prior to the leadership change.

Kelly threats to quit and criticism not new

Mr Kelly has faced criticism from within his party about how he has handled his time in Parliament, with one member describing him as the "Member for Sky News rather than the Member for Hughes" — a criticism of the amount he spends in the nation's television studios rather than connecting with his electorate.

Mr Kelly, unsurprisingly, disagrees with that description and argues the issues he champions in Parliament are those of concern to his electorate.

No stranger to threatening to quit the party, the conservative backbencher has angered colleagues by the timing of this latest preselection fracas.

It follows the defection of fellow Liberal Julia Banks to the crossbench, and is set to dominate the beginning of the final parliamentary sitting week for 2018.

"One of the things that has frustrated me more than anything else in the last few days and the last few weeks is our obsession to be looking at the one thing that the Labor Party can drive a wedge on us, and that is division," Assistant Minister Anne Ruston told the ABC's National Wrap.

"Everything else this Government has done has been absolutely fantastic. I'll stand by this Government's record if we go to the next election.

"And I've got to say none of this is helpful."