Turnbull had promised not to contest the subsequent ballot if the spill was carried.
The new deputy is the Energy Minister Josh Frydenberg, 47, from Victoria, who won overwhelmingly, from fellow Victorian Greg Hunt and Queenslander Steve Ciobo.
Peter Dutton has been under an eligibility cloud, which appears to have been in part lifted by the Solicitor-General’s advice.
The Solicitor-General finds Dutton to be "not incapable" of sitting in parliament after questions were raised about his eligibility through section 44 of the Constitution.
It all comes down to incentives and the size of parliament.
Our revolving door prime ministers are the result of the politicians being too responsive to what we think, and there being too few of them.
Wes Mountain/The Conversation
Whether we end up with Prime Minister Turnbull, Dutton, Morrison or Bishop – it will not be sweetness and light among those who find themselves at the "out-group" when the dust begins to settle.
Turnbull told a news conference that if he is ousted he will quit parliament - increasing the prospect of an early election.
Prtime Minister Malcolm Turnbull will invite a leadership "spill" motion at midday Friday, once a majority of Liberals formally ask for a party meeting.
Michaelia Cash and Mathias Cormann have delivered the death blow to the prime ministership of Malcolm Turnbull.
Malcolm Turnbull's prime ministership appears over, with senior ministers deserting him in favour of challenger Peter Dutton.
Dutton can mobilise his conservative base on race and crime, but what about the broader electorate?
Whoever ends up the Liberal prime minister will need to articulate a more coherent economic policy to help everyday Australians.
Peter Dutton and his supporters do not want Liberal MPs to disperse late Thursday without a vote, fearing a loss of momentum for his campaign.
Rumours circulated last night about the number of names that had been gathered for the petition for the meeting, which requires 43 signatures.
The Senate defeat ends months of wrangling by Senate leader Mathias Cormann to get the tax measure through.
As speculation mounts there will be another leadership challenge sooner rather than later, the government has finally lost its bid to award tax cuts to big companies.
To become prime minister, Turnbull made himself a willing hostage at the outset to right-wing policies that contradicted his political persona.
In staying hostage to this right-wing lunge, rather than fighting to move it back to the mainstream, Turnbull erased his moderate face, destroying his only utility – electoral utility – to the Liberals.
Fierravanti-Wells arriving at Parliament House on Sunday night.
In her resignation letter to the Prime Minister, Fierravanti-Wells reminded him that months ago she had told him Peter Dutton should become deputy Liberal leader, replacing Julie Bishop.
He won. But will he win again?
Peter Dutton has a solid base on which to work to become Liberal leader. That's the way it usually goes- wound the first time, kill the second.
Malcolm Turnbull has survived a leadership challenge from Peter Dutton - for now.
The crowding of the centre-right is having profound consequences for Australian politics, not just Turnbull’s troubled time as prime minister.
Malcolm Turnbull called on the vote in this morning’s meeting, and won.
The prime minister has survived a challenge from the conservative wing of his party- but the deep divisions remain.
Scott Morrison said he asked Peter Dutton about his intentions in Question Time on Monday and was told he was fully supportive of the prime minister.
If the next few days go quietly, Turnbull will live now from poll to poll, with enemies circling like crows over a weakened animal.
There is enough in the Dutton case to raise questions about whether disqualification has occurred.
It is possible the home affairs minister is in breach of Section 44(v) of the Constitution – and if the High Court were to find him so, it would cause yet another headache for the government.
The latest Fairfax Ipsos poll has brought bad news for Malcolm Turnbul - and good news for Bill Shorten.
The latest polls show the government's internal divisions are taking their toll- and some of its members are seriously out of step with the general public on energy policy.
Malcolm Turnbull is faced with a highly volatile situation. But he may need to manage it by taking a risk.
After a week of infighting, it's time for the prime minister to press the party room into taking a decisive stand.
The United Nations says the number of forcibly displaced persons around the world has risen to 68.5 million.
States' approaches to challenges of forced displacement and migration often fail to acknowledge a sometimes competing, but always essential, consideration – the basic dignity of the human person.
Like Dutton, Frydenberg has plenty of ambition.
If Turnbull were hit with a double whammy – having to abandon the company tax cuts and unable to get the NEG – that would be a serious policy flunk.