They are examining evidence around at least four occasions when he may have deliberately misled MPs with his assurances that lockdown regulations were followed.
Mr Johnson, who was fined by the Metropolitan Police for breaching his own COVID-19 laws, has denied deceiving the Commons.
Allies of the ex-Tory leader said he would provide a “detailed and compelling” account to the committee before his appearance, showing that he “did not knowingly mislead the House”.
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The Sunday Times reported he will point to a series of previously undisclosed WhatsApp messages from senior civil servants and members of his No 10 team showing that he had relied upon their advice when he made his statements to Parliament.
He will also publish messages which show that other senior figures in Downing Street believed the gatherings were covered by the “workplace exemption” in the lockdown rules.
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A committee spokesperson said: “The committee has invited Mr Johnson to provide written evidence to the inquiry, should he wish, in advance of the oral evidence session.
“Any such response will be published.
“The committee has said that Mr Johnson may publish his own written evidence, if he chooses, but any such evidence must also be formally submitted to the committee which will itself publish it as soon as is practicably possible after receiving it, after initial analysis (to make sure no redactions of witness names needed, etc).
“The committee would publish on the website in the usual way.”
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Partygate inquiry explained
The panel’s investigation is being chaired by Labour’s Harriet Harman, although the cross-party group has a Tory majority.
The seven-strong committee will decide whether Mr Johnson committed a contempt of Parliament and recommend any punishment, although the final say would fall to the full House of Commons.
Cabinet minister Oliver Dowden told Sky News Sophy Ridge On Sunday programme: “I’m sure Boris Johnson will give a robust defence of himself and then it will be for the committee to to determine the outcome of it.”
Prime Minister Rishi Sunak has said he would not seek to influence MPs on the committee and indicated he would grant a free vote to the Conservative ranks on any sanction that may be proposed.
Asked if he was concerned a suspension of more than 10 days could trigger a by-election in Mr Johnson’s Uxbridge and South Ruislip seat, Mr Sunak added: “This is a matter for Parliament, for the House. It’s not right for the government to get involved.”
In recent days, Commons leader Penny Mordaunt warned against intimidation of members on the privileges committee.
She said they must be “permitted to get on with their work without fear or favour” and emphasised they were are “doing this House a service”.
Mr Johnson and his supporters have raised concerns over partygate investigator Sue Gray’s pending move to Labour leader Sir Keir Starmer’s office from the civil service.
However, the committee has denied its inquiry is based on the Gray report.
Instead, the inquiry has taken evidence from witnesses’ WhatsApp messages, emails and pictures from a Downing Street photographer.
Porn star Stormy Daniels has described to jurors an awkward and unexpected sexual encounter she claims she had with Donald Trump in 2006.
Ms Daniels was testifying at the former president’s criminal trial over hush money she was paid to keep silent about the alleged encounter during the presidential race.
But it was not all bad news for Mr Trump. On the day the court heard from Ms Daniels, his trial in Florida on charges of illegally keeping classified documents at his Mar-a-Lago residence after leaving office, scheduled to start on 20 May, was postponed indefinitely by a federal judge.
Ms Daniels, 45, speaking at the “hush money” trial, said she tried not to think about having sex with him while it was allegedly taking place.
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Stormy Daniels recalls bedroom encounter with Trump
Mr Trump, 76, stared straight ahead when she entered the courtroom and occasionally shook his head and whispered to his lawyer.
After the lunch break, Mr Trump’s defence lawyers demanded a mistrial over what they said were prejudicial and irrelevant comments.
The judge rejected the defence’s request and said defence lawyers should have raised more objections during the testimony.
Later in the day, the Trump team used its opportunity to question Ms Daniels to paint her as motivated by personal hatred of the former president and hoping to profit off her claims against him.
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“Am I correct that you hate President Trump?” defence lawyer Susan Necheles asked.
“Yes,” Ms Daniels acknowledged.
Hush money payment
In the final weeks of Mr Trump’s 2016 Republican presidential campaign, his then-lawyer and personal fixer Michael Cohen paid Ms Daniels $130,000 (£103,000) to keep quiet about what she described as an awkward and unexpected sexual encounter with Mr Trump at a celebrity golf outing in Lake Tahoe in July 2006.
Mr Cohen pleaded guilty to campaign finance violations in 2018 related to the payments and served more than a year in prison – with federal prosecutors saying he acted at Mr Trump’s direction.
Mr Trump, the Republican candidate for president again this year, has pleaded not guilty to charges of falsifying business records to cover up the payment and denies having sex with Ms Daniels.
Imbalance of power
Ms Daniels described how an initial meeting at the golf tournament, where they discussed the adult film industry, progressed to a “brief” sexual encounter she said Mr Trump initiated after inviting her to dinner and back to his hotel suite.
She said she did not feel physically or verbally threatened during the encounter, but she perceived an imbalance of power, with Mr Trump being “bigger and blocking the way”.
She said she found it “hard to get my shoes” after it ended “because my hands were shaking so hard”.
“He said, ‘Oh, it was great. Let’s get together again, honey bunch’,” Ms Daniels said. “I just wanted to leave.”
Mr Trump has been charged with 34 felony counts of falsifying business records in connection with the hush money payments.
Speaking outside of court at the end of the day, Mr Trump said: “This was a very big day, a very revealing day. As you see their case is totally falling apart.”
Ms Daniels is expected to return to the witness stand when the trial resumes tomorrow.
There are moments, more than others, that scream the humiliation of it all.
Take this, before Tuesday’s proceedings got underway. “No descriptions of genitalia or anything but it’s important to elicit that she had sex with him.”
It was the prosecution’s assurance prior to questioning Stormy Daniels after Donald Trump’s lawyers had objected, in advance, to her testifying to the details of sexual acts.
It would be that kind of day in this kind of trial.
In a dingy New York courtroom, this was the president and the porn star, together again, in a reunion most reductive for Mr Trump.
He might have secured guarantees on anatomical detail but, from the moment the court heard “The People call Stormy Daniels” this was Mr Trump with his trousers down, no doubt.
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Ms Daniels told her story, of growing up in Baton Rouge, Louisiana, the daughter of a single mother. She edited her high school newspaper, enjoyed ballet dancing and horses and had ambitions to be a technician.
By the time she met Mr Trump, aged 27, we learned she was an adult film actress and director, star of the likes of 40-Year-Old Virgin and Knocked Up.
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By her telling, the Trump encounter was more Austin Powers – the penthouse suite, the satin pyjamas and the spanking with a rolled-up magazine.
“Bullshit,” Mr Trump was heard to mutter. His problem is that this kind of bullshit sticks.
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Stormy Daniels recalls bedroom encounter with Trump
Whatever his lawyers’ protestations about Ms Daniels’ credibility – and there are holes – that’s hardly the headline for a watching, voting, public.
What will they take from court to the polling booth in November? Quite apart from the imagery, what message does it send to key demographics?
An affair with a porn star, whilst married, is a poor fit with the principles of evangelicals, so critical to the Trump vote in 2016. Suburban women might also reel from this tawdry peek backstage at the presidency.
How much will Mr Trump worry? About $130,000 (£103,000) worth. It is the premium he paid to stop the story coming out in the first place.
There is so much confusion around any potential deal.
But most people here want their prime minister Benjamin Netanyahu to come to an agreement and get the captives back home.
We had a chance encounter with Yehuda Cohen.
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His 19-year-old son Nimrod Cohen, an Israeli soldier, was taken on 7 October.
Mr Cohen’s message to Israel’s leadership was simple – take a deal.
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Right now, however, he is not very hopeful.
“Nothing is moving, we will feel better when something will start moving, that a deal will be on the table, agreed and hostages will start being released,” he said.
Mr Cohen had particular criticism for Mr Netanyahu.
He said of the PM: “He has his own considerations, mainly his private considerations – he wants to survive, he’s thinking only about himself.”
Mr Cohen even challenged Mr Netanyahu in person a few weeks ago about whether a ceasefire would guarantee the release of all the hostages. He did not get an answer.
But she admits: “I’m afraid the deal won’t be done, so I don’t even let myself think about it.
“Until someone tells me – Simona, your daughter has come back, I don’t think about it.”
Seven months into this conflict, following Hamas’ killings and kidnappings, the latest talk of an agreement – however near or far it could be – simply provides no relief for so many hostage families.