Boris Johnson is reportedly urging Conservative MPs to back him for an extraordinary return to Downing Street with a pledge that only he can win the Tories the next election.
Mr Johnson is also pressing Rishi Sunak to reach out and “get back together”, offering an olive branch to the former chancellor after their public falling out at the top of government, reports say.
On Thursday night, Mr Sunak was narrowly ahead of Mr Johnson among Tory MP nominations.
Mr Sunak was leading on 29 Tory MP declarations, followed by 24 for Mr Johnson and 11 for Penny Mordaunt.
Just six weeks after he left No 10 for the final time, forced out by his own MPs after one scandal too many, allies are urging Mr Johnson to run again for a second shot at the Tory crown.
Such a move would be highly divisive within the Conservative Party, with reports that some MPs could resign the whip and sit as independents rather than serve under Mr Johnson.
But his supporters argue that he alone of the candidates to be the new prime minister has won a general election and has a mandate from the British public.
In order to do so, however, he will need to secure the nominations of 100 of the party’s 357 MPs – a target that some at Westminster believe may be beyond him.
Boris Johnson's time as British Prime Minister - in pictures
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Boris Johnson became UK prime minister in July 2019, left, and resigned three years later in July 2022, right. Here 'The National' looks back at his colourful time as leader of the country. Getty Images / Reuters -
Boris Johnson reads a statement outside 10 Downing Street, formally resigning as Conservative Party leader. PA -
Boris Johnson and his wife Carrie Johnson attend the National Service of Thanksgiving to celebrate the Platinum Jubilee of Queen Elizabeth at St Paul's Cathedral in June 2022. Getty Images -
Boris Johnson addresses the media after surviving a confidence vote in his leadership, in June 2022. PA -
Sir Graham Brady, chairman of the 1922 Committee of Tory backbenchers, announcing that Mr Johnson had survived a confidence vote in his leadership at the Houses of Parliament in June. PA -
Mr Johnson chats with residents in a Diamond Jubilee-themed room as he makes a constituency visit to Sweetcroft care home in Uxbridge, in May 2022. Getty Images -
Boris Johnson reads the findings of the Sue Gray report into gatherings on government premises while Covid-19 restrictions were in place, in his office in No 10, Downing Street in May 2022. Photo: Downing Street -
An image of a gathering in the Cabinet Room in No 10, Downing Street in June 2020 on the prime minister's birthday was released alongside the Sue Gray report. Photo: Cabinet Office -
Boris Johnson with a Mark 3 shoulder launch missile system at Thales weapons manufacturer during a visit to Northern Ireland for talks, in May 2022 in Belfast. Getty Images -
Mr Johnson having a turban placed on his head at Gujarat Bio Technology University, during his two-day trip to India in April. Getty Images -
Mr Johnson after apologising to MPs for the 'partygate' fine he had received, in the House of Commons in April. AFP -
Mr Johnson and Ukrainian President Volodymyr Zelenskyy walking in central Kyiv, in April. AFP -
Mr Johnson arrives for a media interview at the Emirates Palace hotel in Abu Dhabi, in March 2022. Getty Images -
Mr Johnson speaks with officers as he makes a constituency visit to Uxbridge police station in December 2021. Getty Images -
Mr Johnson observes an early morning Merseyside Police raid on a home in Liverpool as part of 'Operation Toxic' to infiltrate county lines drug dealings in December 2021. Getty Images -
Boris Johnson during a visit to Westport Care Home in Stepney Green, ahead of unveiling his long-awaited plan to fix the social care system, in September 2021. Getty Images -
Prince Charles looks on as Boris Johnson attempts to open his umbrella at the National Memorial Arboretum in Stafford, in July 2021. Getty Images -
President of the European Council Charles Michel, US President Joe Biden, Japanese Prime Minister Yoshihide Suga, Mr Johnson and Italian PM Mario Draghi pose for the leaders' official photo during the G7 summit in Cornwall, in June 2021. Getty Images -
Mr Johnson poses with his wife Carrie in the garden of No 10, Downing Street following their wedding at Westminster Cathedral, in May 2021. Getty Images -
Mr Johnson visits Hartlepool after the Conservative Party candidate Jill Mortimer won the Hartlepool by-election in May 2021. Getty Images -
Mr Johnson receives his first dose of the AstraZeneca vaccine at St. Thomas' Hospital in London, in March 2021. Getty Images -
Mr Johnson smiles during a televised press conference at No 10, Downing Street in February 2021, as he announces a phased exit from the country's lockdown measures. Getty Images -
Mr Johnson gives a thumbs-up gesture after signing the Brexit trade deal with the EU in No 10, Downing Street, in December 2020. Getty Images -
Mr Johnson and European Commission President Ursula von der Leyen meet for a dinner to try to reach a breakthrough on a post-Brexit trade deal, in December 2020 in Brussels. Getty Images -
Mr Johnson with a vial of the AstraZeneca Covid-19 candidate vaccine, known as AZD1222, at Wockhardt's pharmaceutical manufacturing facility, in November 2020, in Wrexham, Wales. Getty Images -
Mr Johnson drills during his visit to Exeter College in September 2020. Getty Images -
Mr Johnson holds crabs caught on the Carvela at Stromness Harbour in July 2020, during a visit to Scotland. Getty Images -
Mr Johnson holds a painting of a ladybird during a visit to The Discovery School in West Malling, in July 2020. Getty Images -
Mr Johnson and his fiancée Carrie Symonds applaud for key workers outside No 10, Downing Street, in May 2020. Getty Images -
Boris Johnson appears on monitors for a meeting in London. The prime minister chaired the morning update meeting remotely as he was self-isolating after testing positive for Covid-19. Reuters -
Boris Johnson makes a televised address to the nation from inside No 10, Downing Street, with the latest instructions to stay at home to help contain the Covid-19 pandemic, in March 2020. AFP -
Mr Johnson attends the launch of the UK-hosted COP26 Summit at the Science Museum in London, in February 2020. Getty Images -
Mr Johnson is greeted by staff at No 10, Downing Street, after meeting Queen Elizabeth II and accepting her invitation to form a new government in December 2019. PA -
Mr Johnson and his partner Carrie enter Downing Street as the Conservatives celebrate a sweeping election victory in December 2019. Getty Images -
Mr Johnson drives a digger with the words 'Get Brexit Done' inside the digger bucket through a fake wall emblazoned with the word 'GRIDLOCK', during a general election campaign event in December 2019. Getty Images -
Mr Johnson eats pie on the campaign bus in Derby, on the final day of campaigning before the general election in December 2019. Getty Images -
Mr Johnson takes a turn in goal during the warm up before a girls' football match between Hazel Grove United JFC and Poynton Juniors in December 2019. Getty Images -
Mr Johnson poses with workers as he is given a tour of Wilton Engineering Services as part of an election campaign trail stop in November 2019, in Middlesbrough. Getty Images -
Mr Johnson poses for a photo wearing boxing gloves during a stop on his general election campaign trail in Manchester, in November 2019. Getty Images -
Mr Johnson eats a rock sweet which reads 'Back Boris' during a general election campaign trail stop in Blackpool, in November 2019. Getty Images -
Mr Johnson leads a bull around a pen as he visits Darnford Farm near Aberdeen, Scotland, in September 2019. Getty Images -
Former US president Donald Trump and Mr Johnson arrive for a bilateral meeting during the G7 summit in August 2019, in Biarritz, France. Getty Images -
Queen Elizabeth welcomes Mr Johnson as the newly elected leader of the Conservative party and invites him to become prime minister and form a new government, at Buckingham Palace in July 2019. Getty Images
There was no immediate word from Mr Johnson – who was thought to be holidaying with his family in the Caribbean – on his intentions.
But diehard loyalist Nadine Dorries, the former culture secretary, said she had spoken to him after Ms Truss’s resignation and hinted strongly that he was preparing to run.
“He is a known winner and that is certainly who I’m putting my name against because I want us to win the general election. Having a winner in place is what the party needs to survive,” she told Sky News.
Mr Johnson has put his ability to win elections - he secured the biggest Tory majority for three decades in 2019 - at the heart of his pitch, says The Telegraph.
“If the Tories are serious about winning in 2024 and want to stop a general election before then they need to revert to the guy with a mandate who is a seasoned campaigner," an ally of Mr Johnson told the newspaper.
"They need someone to take the fight to Labour. There’s no point going to a yellow box junction without knowing how you are going to get out of it. Rishi should make contact and work out how the two of them can get back together.”
Boris Johnson through the years - in pictures
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Boris Johnson has had an eventful time during his life in politics and journalism. Here, 'The National' looks back at his life in pictures. Getty Images -
Mr Johnson attends the coronation ceremony of Britain's King Charles III at Westminster Abbey in May. Getty Images -
Mr Johnson leaves his home to attend a televised evidence session in March in front of the Commons Privileges Committee. Getty Images -
Mr Johnson listening to Ukrainian President Volodymyr Zelenskyy address parliamentarians in Westminster Hall in February. Getty Images -
Mr Johnson and Carrie Johnson arrive at Westminster Abbey for the state funeral of Queen Elizabeth II in September 2022. Getty Images -
Mr Johnson he announces his resignation as prime minister outside 10 Downing Street in July 2022. Getty Images -
Mr Johnson at a press conference in response to the publication of the Sue Gray report into Partygate at Downing Street in May 2022. Getty Images -
Mr Johnson reads the long-awaited report by senior civil servant Sue Gray into the Downing Street party scandal, in his Downing Street office in May 2022. Photo: Downing Street -
Mr Johnson and Ukrainian President Volodymyr Zelenskyy in central Kyiv in April 2022. The British prime minister paid an unannounced visit to Kyiv in a show of solidarity with Ukraine. AFP -
Mr Johnson watches an early morning police raid on a home in Liverpool as part of an operation to thwart drug dealing, in December, 2021. Getty Images -
The prime minister battles with his umbrella while with Prince Charles at The National Memorial Arboretum in July 2021, in Stafford, England. Getty Images -
Mr Johnson and his wife before the Uefa European Championship final between Italy and England at Wembley Stadium, London, in July last year. Getty Images -
The British prime minister with US President Joe Biden, European Council President Charles Michel, former Japanese prime minister Yoshihide Suga and Italian Prime Minister Mario Draghi during the G7 Summit in Cornwall, in June 2021. Getty Images -
Mr Johnson with his wife Carrie in the garden of 10 Downing Street after their wedding at Westminster Cathedral, in May last year. Getty Images -
Boris Johnson visits Hartlepool after Conservative Party candidate Jill Mortimer won a parliamentary by-election in May, 2021. Getty Images -
The prime minister after receiving the first dose of the AstraZeneca vaccine at St Thomas' Hospital in London in March, 2021. Getty Images -
Boris Johnson after signing a Brexit trade deal with the EU in December 2020. Getty Images -
Mr Johnson examines a vial of the AstraZeneca Covid-19 candidate vaccine, at a pharmaceutical manufacturing facility in Wrexham, Wales, in November 2020. Getty -
Mr Johnson demonstrating the two-metre distancing rule during his visit to St Joseph's Catholic Primary School in Upminster, East London, in August 2020. PA -
In this photo, published alongside the Sue Gray report into the Partygate affair, Mr Johnson is seen at a gathering in the Cabinet Room in 10 Downing Street on his birthday in June, 2020. Getty Images -
Mr Johnson and former chancellor Rishi Sunak use hand sanitiser during a visit to the Pizza Pilgrims restaurant in June 2020, in east London, to see how they are getting their business ready to reopen as coronavirus lockdown restrictions were lifted in England. PA -
Mr Johnson and his fiancee Carrie Symonds applaud key workers outside 10 Downing Street in May 2020, during the coronavirus pandemic. Getty Images -
Mr Johnson in the Cabinet Room observing a minute's silence in April 2020 in a tribute to the health staff and key workers who died during the coronavirus outbreak. PA -
Boris Johnson appears on monitors for a meeting in March 2020. The prime minister chaired morning meetings on the coronavirus remotely from Number 11 Downing Street, while self-isolating after testing positive for the virus. Reuters -
Members of a family listen as BMr ris Johnson makes a televised address to the nation from 10 Downing Street in March 2020, where he outlined the latest instructions to stay at home to help contain the Covid-19 outbreak. AFP -
Mr Johnson speaks to British troops stationed in Estonia during a one-day visit to the Baltic country in December 2019. Getty Images -
Mr Johnson and Carrie Symonds enter Downing Street as the Conservatives celebrate a sweeping election victory in December 2019. Getty -
Boris Johnson is greeted by staff at 10 Downing Street after meeting Queen Elizabeth II and accepting her invitation to form a new government in December 2012. PA -
Former US president Donald Trump and Mr Johnson arrive for a bilateral meeting during the G7 summit in August 2019 in Biarritz, France. Getty -
The queen welcomes Mr Johnson as the newly elected leader of the Conservative Party, during an audience in July 2019. Getty Images -
Mr Johnson, then Britain's foreign secretary, stands in front of St Basil's Cathedral during a visit to Moscow's Red Square in December 2017. Getty -
Mr Johnson collides with a child during a Street Rugby tournament in Tokyo in 2015, held to mark Japan hosting the 2019 Rugby World Cup -
As mayor of London Mr Johnson competes in a tug-of-war in October 2015. Getty Images -
The Olympic Flag is passed from Mr Johnson to IOC President Jacques Rogge during the closing ceremony of the London 2012 Olympic Games. Getty Images -
Mayor of London Boris Johnson with Prime Minister David Cameron during the lighting of the Paralympic Cauldron in Trafalgar Square, in August 2012. PA -
Boris Johnson gets stuck on a zip-line during a BT London Live event in Victoria Park in August 2012. Getty -
Mr Johnson and Lord Sebastian Coe cheer as a giant set of Olympic rings is displayed from Tower Bridge in June 2012, Getty Images -
Mr Johnson gestures attends a Harry Potter studio tour of Diagon Alley, at the Warner Brother Studios, London, in December 2011. AP Photo -
Mr Johnson at the launch of London's first cycle hire scheme in July 2010. Getty Images -
Mr Johnson with artists' impressions of the design for London's new Routemaster bus in May 2010. Getty Images -
The candidates to be mayor of London; Labour's Ken Livingstone, Conservative Boris Johnson and Liberal Democrat Brian Paddick, being questioned on BBC's 'Newsnight' programme in April 2008. Getty Images -
Boris Johnson on the North Pier in Blackpool during the Conservative Party conference there in October 2005. Getty Images -
Mr Johnson at his desk in 2000 while he was a journalist for 'The Telegraph'. Getty Images -
Mr Johnson when he was president of the Oxford Union society speaking to the Greek minister for culture Melina Mercouri when she addressed the union. Reuters -
Boris Johnson in September 1979, at Eton School. Shutterstock
Veteran backbencher Sir Roger Gale, a long-time critic of Mr Johnson, warned that if he succeeds he could be met with a wave of resignations by Tory MPs.
“I think that there would be people, indeed like myself, who would find ourselves in the awful position of having to resign the Conservative whip,” he told Times Radio.
Labour leader Sir Keir Starmer, who called for an immediate general election, said the potential return of a man deemed “unfit for office” by his own MPs “adds insult to injury” for voters.
For critics, a comeback would be particularly problematic as Mr Johnson still faces an investigation by the Commons privileges committee over claims he lied to Parliament over lockdown parties in Downing Street, which could see him expelled as an MP.
As well as Mr Sunak and Ms Mordaunt, some MPs would like Defence Secretary Ben Wallace to stand, although he has given no indication he intends to do so.
Other names in the frame include Suella Braverman, who was forced to quit as home secretary by Ms Truss, and International Trade Secretary Kemi Badenoch – both of whom stood in the last contest – although they may struggle to get the nominations.
Boris Johnson applauded in the halls of Number 10 as he leaves - video
Under the rules set out by Sir Graham Brady – the chairman of the Conservatives' backbench 1922 Committee – and party chairman Sir Jake Berry, nominations will close at 2pm on Monday.
The first ballot of MPs will then be held between 3.30pm and 5.30pm on Monday – if there are three candidates with the required number of nominations, the loser will be eliminated.
Once there are two candidates remaining, an indicative vote will be held so that the party membership know which is the preferred option among MPs.
Members will be able to take part in an online vote to choose their next leader and the country’s prime minister with the contest due to conclude by October 28.
The rules appear designed to encourage the candidate who finishes second to stand aside for the winner, ensuring the new leader has the support of the majority.
But few believe that if that is Mr Johnson, who remains hugely popular among ordinary members, he would do so.
Boris Johnson's final PMQs: Most memorable moments - video
Tory grandee Sir Geoffrey Clifton-Brown, however, said it was important that the new leader commanded as much support as possible among the MPs.
“It is the members of Parliament who have to work with a prime minister and I think it is very, very important that as many members of Parliament are satisfied with the candidate,” he told BBC2.
Ms Truss’s resignation on Thursday after just 44 days in office brings to an end the shortest premiership in British history.
It followed weeks of financial and political turmoil after then-chancellor Kwasi Kwarteng’s calamitous £45 billion ($50bn) mini-budget giveaway that led to a collapse in support for Ms Truss among Tory MPs.
