Mr Johnson flew to Gatwick Airport in economy alongside his wife and children and there was “mixed reaction” as he and his family boarded the plane before everyone else, according to our US correspondent Mark Stone.
He said several passengers looked “slightly bewildered” and there were a few boos.
The flight was tracked by around 7,000 people through the FlightRadar24 website.
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Mr Johnson waved to the press after he landed at Gatwick Airport and was ushered quickly through the VIP terminal by security.
He was then taken to a Range Rover which took him away from the airport.
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Mr Johnson officially resigned six weeks ago after a series of scandals and mass resignations among his ministers but is still popular among some Tory MPs and the party membership.
Image: Mr Johnson waves to the media as he leaves Gatwick Airport
Several cabinet ministers have said they would back Mr Johnson in the contest.
Former home secretary Priti Patel said she was backing Mr Johnson because he has a “proven track record”.
Earlier backers include Jacob Rees-Mogg, the business secretary, Ben Wallace, the defence secretary, and Simon Clarke, the levelling up secretary.
Mr Rees-Mogg was the first to declare himself for the former prime minister, posting on social media: “I’m backing Boris #BorisorBust.”
After ruling himself out of the race, Mr Wallace said he is “leaning towards Boris Johnson”.
He warned that colleagues “have to focus” on who will bring unity and be able to win the next election.
Tory MPs wishing to enter the race must secure the backing of 100 MPs by 2pm on Monday.
Mr Johnson remains a divisive figure, however, and some Conservative MPs have threatened to withdraw the party whip if he returns.
Lord Frost, a former Brexit minister and close ally of Mr Johnson, called on his party colleagues to back Rishi Sunak.
Jesse Norman, the Foreign Office minister, said selecting Mr Johnson as Conservative leader would be “absolutely catastrophic”.
Sir Roger Gale, the senior backbencher, reminded voters in a tweet that the former prime minister remains under investigation by the Commons privileges committee for potentially misleading the House over partygate.
Sir Roger told Times Radio that, if Mr Johnson is voted back in as prime minister, he would give up the whip and stand as an independent.
Asked about Mr Johnson’s chances at a second run for office, one cabinet minister told Beth Rigby, Sky News’ political editor: “I’d expect him to get to 100.
“Even people who resigned from his government were on the terrace yesterday telling colleagues they would now back him and members definitely will.”
A friend of Mr Johnson also told Sky News it is “likely” he will stand.
While the politicians talk, so many people come from around the world to try to get across the Channel on small boats. But why?
Why make such a perilous crossing to try to get to a country that seems to be getting increasingly hostile to asylum seekers?
As the British and French leaders meet, with small boats at the forefront of their agenda, we came to northern France to get some answers.
It is not a new question, but it is peppered with fresh relevance.
Over the course of a morning spent around a migrant camp in Dunkirk, we meet migrantsfrom Gaza, Iraq, Eritrea, South Sudan, Sri Lanka and beyond.
Some are fearful, waving us away; some are happy to talk. Very few are comfortable to be filmed.
All but one man – who says he’s come to the wrong place and actually wants to claim asylum in Paris – are intent on reaching Britain.
They see the calm seas, feel the light winds – perfect conditions for small boat crossings.
John has come here from South Sudan. He tells me he’s now 18 years old. He left his war-torn home nation just before his 16th birthday. He feels that reaching Britain is his destiny.
“England is my dream country,” he says. “It has been my dream since I was at school. It’s the country that colonised us and when I get there, I will feel like I am home.
“In England, they can give me an opportunity to succeed or to do whatever I need to do in my life. I feel like I am an English child, who was born in Africa.”
Image: ‘England is my dream country,’ John tells Adam Parsons
He says he would like to make a career in England, either as a journalist or in human resources, and, like many others we meet, is at pains to insist he will work hard.
The boat crossing is waved away as little more than an inconvenience – a trifle compared with the previous hardships of his journey towards Britain.
We meet a group of men who have all travelled from Gaza, intent on starting new lives in Britain and then bringing their families over to join them.
One man, who left Gaza two years ago, tells me that his son has since been shot in the leg “but there is no hospital for him to go to”.
Next to him, a man called Abdullah says he entered Europe through Greece and stayed there for months on end, but was told the Greek authorities would never allow him to bring over his family.
Britain, he thinks, will be more accommodating. “Gaza is being destroyed – we need help,” he says.
Image: Abdullah says ‘Gaza is being destroyed – we need help’
A man from Eritreatells us he is escaping a failing country and has friends in Britain – he plans to become a bicycle courier in either London or Manchester.
He can’t stay in France, he says, because he doesn’t speak French. The English language is presented as a huge draw for many of the people we talk to, just as it had been during similar conversations over the course of many years.
I ask many of these people why they don’t want to stay in France, or another safe European country.
Some repeat that they cannot speak the language and feel ostracised. Another says that he tried, and failed, to get a residency permit in both France and Belgium.
But this is also, clearly, a flawed survey. Last year, five times as many people sought asylum in France as in Britain.
And French critics have long insisted that Britain, a country without a European-style ID card system, makes itself attractive to migrants who can “disappear”.
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1:48
Migrant Channel crossings hit new record
A young man from Iraq, with absolutely perfect English, comes for a chat. He oozes confidence and a certain amount of mischief.
It has taken him only seven days to get from Iraq to Dunkirk; when I ask how he has made the trip so quickly, he shrugs. “Money talks”.
He looks around him. “Let me tell you – all of these people you see around you will be getting to Britain and the first job they get will be in the black market, so they won’t be paying any tax.
“Back in the day in Britain, they used to welcome immigrants very well, but these days I don’t think they want to, because there’s too many of them coming by boat. Every day it’s about seven or 800 people. That’s too many people.”
“But,” I ask, “if those people are a problem – then what makes you different? Aren’t you a problem too?”
He shakes his head emphatically. “I know that I’m a very good guy. And I won’t be a problem. I’ll only stay in Britain for a few years and then I’ll leave again.”
A man from Sri Lanka says he “will feel safe” when he gets to Britain; a tall, smiling man from Ethiopia echoes the sentiment: “We are not safe in our home country so we have come all this way,” he says. “We want to work, to be part of Britain.”
Emmanuel is another from South Sudan – thoughtful and eloquent. He left his country five years ago – “at the start of COVID” – and has not seen his children in all that time. His aim is to start a new life in Britain, and then to bring his family to join him.
He is a trained electrical engineer, but says he could also work as a lorry driver. He is adamant that Britain has a responsibility to the people of its former colony.
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US President Donald Trump is putting “heavy” pressure on Israeli Prime Minister Benjamin Netanyahu to end the war in Gaza, two sources close to the ceasefire negotiations have told Sky News.
One US source said: “The US pressure on Israel has begun, and tonight it will be heavy.”
A second Middle Eastern diplomatic source agreed that the American pressure on Israel would be intense.
Image: Benjamin Netanyahu gave Donald Trump a letter saying he had nominated him for a Nobel Peace Prize. Pic: AP
Netanyahu arrived in Washington DC in the early hours of Monday morning and held meetings on Monday with Steve Witkoff, Trump’s Middle East envoy, and Marco Rubio, the secretary of state and national security adviser.
The Israeli prime minister plans to be in Washington until Thursday with meetings on Capitol Hill on Tuesday.
Trump has made clear his desire to bring the Gaza conflict to an end.
However, he has never articulated how a lasting peace, which would satisfy both the Israelis and Palestinians, could be achieved.
His varying comments about ownership of Gaza, moving Palestinians out of the territory and permanent resettlement, have presented a confusing policy.
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2:36
‘Israel has shifted towards economy of genocide’
Situation for Palestinians worse than ever
Over the coming days, we will see the extent to which Trump demands that Netanyahu accepts the current Gaza ceasefire deal, even if it falls short of Israel’s war aims – the elimination of Hamas.
The strategic objective to permanently remove Hamas seems always to have been impossible. Hamas as an entity was the extreme consequence of the Israeli occupation.
The Palestinians’ challenge has not gone away, and the situation for Palestinians now is worse than it has ever been in Gaza and also the West Bank. It is not clear how Trump plans to square that circle.
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5:13
‘Some Israeli commanders can decide to do war crimes’
Trump’s oft-repeated desire to “stop the killing” is sincere. Those close to him often emphasise this. He is also looking to cement his legacy as a peacemaker. He genuinely craves the Nobel Peace Prize.
In this context, the complexities of conflicts – in Ukraine or Gaza – are often of secondary importance to the president.
If Netanyahu can be persuaded to end the war, what would he need?
The hostages back – for sure. That would require agreement from Hamas. They would only agree to this if they have guarantees on Gaza’s future and their own future. More circles to square.
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17:44
Trump 100: We answer your questions
Was White House dinner a key moment?
The Monday night dinner could have been a key moment for the Middle East. Two powerful men in the Blue Room of the White House, deciding the direction of the region.
Will it be seen as the moment the region was remoulded? But to whose benefit?
Trump is a dealmaker with an eye on the prize. But Netanyahu is a political master; they don’t call him “the magician” for nothing.
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Trump makes decisions instinctively. He can shift position quickly and often listens to the last person in the room. Right now – that person is Netanyahu.
Gaza is one part of a jigsaw of challenges, which could become opportunities.
Diplomatic normalisation between Israel and the Arab world is a prize for Trump and could genuinely secure him the Nobel Peace Prize.
But without the Gaza piece, the jigsaw is incomplete.
Only one issue remains unresolved in the push to achieve a ceasefire in Gaza, according to Sky sources.
Intense negotiations are taking place in Qatar in parallel with key talks in Washington between US President Donald Trump and Israeli Prime Minister Benjamin Netanyahu.
Two sources with direct knowledge of the negotiations have told Sky News that disagreement between Israel and Hamas remains on the status and presence of the Israel Defence Forces (IDF) inside Gaza.
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2:10
Gaza ceasefire deal in progress
The two sides have bridged significant differences on several other issues, including the process of delivering humanitarian aid and Hamas’s demand that the US guarantees to ensure Israel doesn’t unilaterally resume the war when the ceasefire expires in 60 days.
On the issue of humanitarian aid, Sky News understands that a third party that neither Hamas nor Israel has control over will be used in areas from which the IDF withdraws.
Image: Benjamin Netanyahu briefed reporters on Capitol Hill about the talks on Tuesday. Pic: AP
This means that the controversial Gaza Humanitarian Foundation (GHF) – jointly run by an American organisation and Israel – will not be able to operate anywhere where the IDF is not deployed. It will limit GHF expansion plans.
It is believed the United Nations or other recognised humanitarian organisations will adopt a greater role.
On the issue of a US guarantee to prevent Israel restarting the war, Sky News understands that a message was passed to Hamas by Dr Bishara Bahbah, a Palestinian American who has emerged as a key back channel in the negotiations.
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The message appears to have been enough to convince Hamas that President Trump will prevent Israel from restarting the conflict.
However, there is no sense from any of the developments over the course of the past day about what the future of Gaza looks like longer-term.
Final challenge is huge
The last remaining disagreement is, predictably, the trickiest to bridge.
Israel’s central war aim, beyond the return of the hostages, is the total elimination of Hamas as a military and political organisation. The withdrawal of the IDF, partial or total, could allow Hamas to regroup.
One way to overcome this would be to provide wider guarantees of clear deliverable pathways to a viable future for Palestinians.
But there is no sense from the negotiations of any longer-term commitments on this issue.
Two key blocks have been resolved over the past 24 hours but the final challenge is huge.
The conflict in Gaza erupted when Hamas attacked southern Israel in October 2023, killing around 1,200 people and taking 251 hostages, according to Israeli figures. Some 20 hostages are believed to remain alive in Gaza.
Israel has killed more than 57,000 Palestinians, according to Gaza’s Hamas-run health ministry, which does not distinguish between combatants and civilians.