Senior ministers Mathias Cormann, Michaelia Cash and Mitch Fifield told Turnbull on Thursday that he had lost his government's support and must hold a ballot of conservative Liberal Party lawmakers to elect a new leader quickly.
The ministers, who supported Mr Turnbull in a leadership ballot on Tuesday against former home affairs minister Peter Dutton, said they had changed their position and now backed Mr Dutton.
He demanded Mr Dutton get at least 43 signatures to force a leadership spill - and promised to quit as prime minister if it goes ahead.
Turnbull said if he received the letter requesting a fresh vote, he would call a party meeting for midday on Friday (9am, Bangkok).
"The party room endorses Malcolm Turnbull as their leader and that's where it stands".
Treasurer Scott Morrison also pledged to challenge for the top job, local media reported.
Dutton said he was canvassing for support to take another tilt at Turnbull, possibly as early as this week.
Peter Dutton from Austin, Texas (left) has been inundated with messages since the Liberal leadership challenge got underway.
"I can not underline too much how important it is that anyone who seeks to be prime minister of Australia is eligible to be a member of parliament", Turnbull said.
Opposition Labor Party leader Bill Shorten told Parliament it was evidence that "Australia no longer has a functioning government".
Mr Turnbull won the party-room vote 48-35 but the narrow margin of the victory made another challenge nearly certain in a country that has earned a reputation for a revolving door of political leaders, with six prime ministers since 2009.
However, he said if his colleagues at the meeting told him they wanted a vote, he would not contest his job and would leave parliament.
If a three-way vote is held, whoever comes last in the first round of voting will be eliminated, and then a second round of voting will decide who becomes the prime minister.
All seven had tendered their resignations to Turnbull, who refused them in an attempt to show unity and later said he had been given "unequivocal assurances of continuing loyalty".
Dutton and his supporters, including former prime minister Tony Abbott who once described climate change as "absolute crap", argue that keeping power prices down was more important than meeting Canberra's commitment to slash carbon emissions by 26 percent by 2030.
"Australians will be rightly appalled by what they're witnessing in their nation's parliament today and in the course of this week", Mr Turnbull told reporters.
The government adjourned the lower house on Thursday afternoon, suggesting that Turnbull's priorities lay with handling the latest party mutiny.
In a frantic Thursday morning, Australia's opposition parties lost a parliament vote that would have forced a court to determine whether Dutton is eligible for the premiership.
The government shut down the House of Representatives but does not command the numbers in the Senate so had to endure question time with senior ministers who had resigned on the backbench.
The Solicitor-General has spent the night considering whether Mr Dutton's financial interest in two childcare centres that receive government subsidies makes him ineligible to sit in Parliament.
The closest Palace came to scoring was when Andros Townsend curled a long-rage shot against the crossbar in the first half. We don't have to make it something it was not. 'Palace play a system they play all the time with high-quality players.
To protect the promise of freedom for Holocaust survivors and their families, President Trump prioritized the removal of Palij. Palij's US citizenship was revoked in August 2003 based on his alleged involvement in war crimes and his immigration fraud.
While Akshay's Gold had released on 3,050 screens in India, John's action drama was released on 2,500 screens. Reema Kagti's Gold had a strong opening day and managed to clock around Rs 25. 25 crore at the box office.
But the refusal to accept foreign funds to deal with disaster management and rehabilitation has been a consistent policy of India. But Manmohan Singh's UPA government reversed the policy of accepting foreign assistance in coping with post-calamity challenges.
And there was one person in particular that she noted, to applause from the audience: her boyfriend Alex Rodriguez . At least MTV did play a clip of Franklin, who died last week, singing "I Say A Little Prayer".
Drake later posted one to Instagram , captioning it: "Me and my love Sofia talking about Bieber and Owls and Basketball ". In another photo, Sofia poses with a Scorpion hat, that's clearly her new favourite accessory.
He had always been in MGM and Eon's sights to board a James Bond movie, dating back to 2012's " Skyfall " and 2015's " Spectre ". It was also viewed as a surprise that the filmmaker, who had avoided franchises in the past, would board the Bond machine.
The Natural Resources Defense Council called the replacement proposal President Donald Trump's "Dirty Power Plan ". Trump has already vowed to pull the US out of the Paris climate agreement as he pushes to revive the coal industry.
Fans and critics are divided after a hard summer in the market and tough start to the season. "We know they're a strong team". In total, just 28 goals were conceded in 38 games past year and in half of their league games, they kept clean sheets.
The pair met in 2004 when Argento cast Bennett, then just 7, to play her son in " The Heart Is Deceitful Above All Things ". Weinstein has since been charged in NY with first- and third-degree rape and first-degree commission of a criminal sex act.
Turnbull not in the clear after challenge
Malcolm Turnbull has rejected claims that changes to his energy policy are aimed at holding off a leadership challenge. Peter Dutton is contesting Malcolm Turnbull for the leadership of the Liberal party in a party room meeting.
Putin deplores US sanctions, but lauds Trump meeting
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Chelsea Hit Back As Marcos Alonso Sinks Arsenal
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India in charge of third test with England
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Nvidia's Latest GPUs Aim to Boost the Realism of Graphics
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Big Ten places five teams in top 15 of AP preseason poll
Oklahoma entered the 1985-87 seasons as the nation's top team but finished the season No. 1 just once over that span, in 1985. It's UM's highest ranking to open the season since starting as the No. 5 team in the country in 2004.
Djokovic closing in on incredible record
Djokovic had to work for more than two and a half hours to overcome Cilic , the 2016 champion in the combined WTA and ATP event. Halep was scheduled to then face Ashleigh Barty in the final match of the day, but it, too, was rescheduled for Friday morning.
Kerala floods: Relief teams rescue 22,000 as rains ease
Parts of Kerala's commercial capital, Cochin, are under water, snarling up roads and leaving railways across the state impassable. Before that Home Minister Rajnath Singh and Kiren Rijiju had sanctioned Rs 100 crore and Rs 80 crore, respectively.
Jose Mourinho laments Manchester United 'mistakes'
This was a great win for Brighton , but it raises a lot of questions for Manchester United's title aspirations. Guardiola, however, insists that "buying class" is not something City were attempting to do in the project.