Australian Foreign Minister Julie Bishop has resigned from the cabinet set up by new Prime Minister Scott Morrison.
Her move came as new Prime Minister Scott Morrison named his cabinet after winning a bruising leadership contest on Friday.
The National Public Radio, in its website, reported that, "Turnbull faced opposition from conservative members of his party over low poll numbers as the country approaches a general election in May 2019".
Turnbull became the fourth prime minister to be dumped by his or her own party since 2010 in response to poor opinion polling.
Tony Abbott, who was prime minister before Mr Turnbull and is a key ally of Mr Dutton, declared on Monday that the government would not turn against Mr Morrison.
Mr Abbott supported his sister, who is a lesbian and clashed with her former seminarian brother in last's year's debate about whether Australia should legalise gay marriage.
"It's nearly a deafness that we still see in Australian society", she said.
He thanked his supporters, adding: "Former prime ministers are best out of Parliament, not in it, and I think recent events best underline the value of that observation".
"I didn't always see eye to eye with Julie Bishop but no one, no one could dispute that she was a person who presented the case for Australia with a bit of flair", he told reporters. Frydenberg will also serve as Treasurer.
The Energy and Environment has also been split, with Melissa Price becoming the Environment minister, while Angus Taylor was given the Energy role.
Dutton, who had stepped down as Home Affairs Minister in the lead up to his initial challenge, has been reappointed as Homes Affairs Minister but has lost the Immigration portfolio which will now be handled by David Coleman.
His departure will trigger a by-election and place Mr Morrison's parliamentary majority at risk.
Speaking on last week's leadership spill, he did say Peter Dutton was "a most reluctant challenger, just as I was back in 2009".
Former Deputy Prime Minister Barnaby Joyce has also been handed a new role as the special envoy for drought assistance and recovery. Moderate Christopher Pyne was promoted to defence minister.
As Australia's treasurer, Mr Morison reduced the budget deficit.
"Government stability is being restored, we are getting on with the job", he said.
In 2015 the Abbott camp felt betrayed, believing that Scott Morrison had not backed him wholeheartedly, despite being a Christian conservative.
Mr Turnbull's seat in the wealthy Sydney enclave of Wentworth is traditionally a Liberal safe haven, although a backlash against the government's political infighting could make this less certain.