Boris Johnson could be forced to give evidence in person over his relationship with Jennifer Arcuri, the Mirror can reveal.
The Prime Minister could face a legal summons to appear as a witness before the Greater London Authority later this year, insiders confirmed – though No10 is expected to resist such a move.
The PM also faces questions over reckless intimate texts sent to the American businesswoman while she claims they were in the midst of a four-year affair.
Sir Alistair Graham, former chairman of the Committee on Standards in Public Life, said: “This Government is in danger of becoming known as a sleaze government with no concern for abiding by decent ethical standards of behaviour.”
In fresh revelations Ms Arcuri, 35, said Mr Johnson asked her to send him intimate pictures in a text messages on his personal mobile phone.
Messages seen by the Mirror show at least one request was made while he was on a taxpayer-funded trade mission to Israel as Mayor of London.
As the messages between the pair became more heated, cybersecurity expert Ms Arcuri became increasingly concerned about who might be able to intercept them.
It is feared Mr Johnson could have left himself open to his communications being intercepted by hostile foreign states.
Ms Arcuri says that in one message Mr Johnson requested a snap with the instructions: “No clothes on.”
She claims she replied with a raunchy pic from an arty shoot, to which he replied: “Wow.”
Mr Johnson also appeared to complain of having “a sore knee and sheet burn” after what Ms Arcuri claims was a sexual encounter.
Mr Johnson appears to say his injuries were “acquired in a good cause”.
On a separate occasion he replied to a racy picture of her by describing it as “enough to make a bishop kick a hole in a stained-glass window”.
And in other messages she jokingly referred to herself as his “personal penetration tester”.
Ms Arcuri says that when they first met, Mr Johnson was a technology dinosaur with a “wretched old Nokia”.
She claims she warned the then-Mayor personally to take more care and encouraged him to download encrypted messaging app Telegram.
In one message passed to this newspaper, she said: “Hey! We HAVE to set up a VPN for you to encrypt your phone and devices. I have to make u secure!
“Do not be humiliated like your colleagues n a few ministers who still don’t get it. I refuse to let you be in that boat.”
But Ms Arcuri, who now runs a cybersecurity company with husband Matthew Hickey, says her lessons on secure messaging fell on deaf ears.
Boris Johnson faces an inquiry by the Greater London Authority – responsible for the mayor’s office – over claims his failure to declare his relationship with Arcuri may have been a breach of the Nolan Principles of Public Life, which are contained in the Mayor of London’s code of conduct.
Arcuri was granted access to events at three top level trade missions, despite her businesses not meeting the criteria for the trips.
The Independent Office for Police Conduct said there was no evidence he’d committed the criminal offence of misconduct in public office but he may have breached the Nolan Principles.
Len Duvall, the chair of the GLA oversight committee which is conducting the investigation said: “Our investigation will consider whether Boris Johnson conducted himself in a way that’s expected from anyone in that position.
“It’s important we get those answers, because Londoners deserve to have their politicians held accountable.”
On the trip to Israel, Mr Johnson attempted to arrange a meeting with Ms Arcuri while he was in Jerusalem and she was an hour’s drive away in Tel Aviv.
As that was not possible, he sent a “desperate request” for a racy pic from the five-star King David Hotel, where he had been gifted a room by the Israeli government.
She says he previously tried to arrange a meeting on a mayoral trip to New York, while staying in a suite in the plush Lexington Hotel.
Ms Arcuri told the Sunday Mirror yesterday how she had an “intimate relationship” with Mr Johnson from 2012 to 2016, while he was Mayor and still married to second wife Marina Wheeler.
The cybersecurity expert was granted access to three high-level trade missions and won a string of public grants, though she has always insisted Mr Johnson had no influence on this.
Last year the Independent Office for Police Conduct said there was no evidence he had committed the criminal offence of misconduct in public office.
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But the watchdog said it would have been “wise” for him to have declared the relationship – and said he may have breached the Nolan Principles for Public Life for not doing so.
The GLA will now resume its probe into Mr Johnson’s conduct, which was paused when the police watchdog began its investigation and delayed again during the pandemic.
It will examine whether Mr Johnson behaved with “honesty and integrity”, whether Ms Arcuri was given “preferential treatment” and if there was any conflict of interest which should have been declared.c
Caroline Pidgeon, a Lib Dem member of the GLA Oversight Committee, told the Mirror: “We should not forget that the extensive IOPC investigation concluded that Johnson should have declared an interest, and that this failure could have amounted to a breach of the code of conduct while he was Mayor of London.
“The intimate relations of politicians are a personal matter, but favouring people in awarding contracts and public money because of a personal relationship is a totally different matter.
“The case for Boris Johnson being summoned and having to answer vital questions over whether he was putting personal interests before the interests of Londoners has suddenly become stronger.”
The committee can summon anyone who has been mayor within the past eight years.
If he refuses to attend without “reasonable excuse” he could potentially face a fine or even a maximum three-month jail term.
Last year committee chairman Len Duvall said: “We will be fully exploring every avenue that we have at our disposal to make sure we get to the bottom of these allegations.
“That means the possibility of summoning not just the Prime Minister, but maybe others too.”
Shadow Cabinet Office minister Fleur Anderson said: “This week, Labour challenged the Conservatives on when they were going to publish the delayed Register of Ministers’ Interests – a breach of the ministerial code – but got little reassurance that they are taking that delay seriously.
“The Prime Minister’s form is particularly poor on this, as these new revelations underline.
“Given the catalogue of cronyism surrounding the Tories, they should be ramping up transparency and accountability urgently.”
Telling of her fears for Mr Johnson’s phone security at the time she says they were having an affair, Ms Arcuri said: “Before going to Tel Aviv, I said, ‘Who the hell is preparing your security devices?’
“He said, ‘It’s all good, it’s all good’.
“I said, ‘It’s not all good.”
Ms Arcuri says Mr Johnson continued to send her text messages, meaning the contents of the exchanges could potentially be accessed by his mobile carrier. She claims other messages were sent via Apple’s iMessaging service.
Most people who use Apple devices such as iPads and iPhones allow their data to be backed up on iCloud, meaning the contents are stored on Apple’s servers and could potentially be seen by employees.
Other messaging services such as WhatsApp or Telegram are encrypted, meaning the provider has no access to them.
Last night number 10 declined to comment.
– READ THE FULL STORY OF JENNIFER ARCURI’S REVELATIONS IN THE MIRROR