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.
New pictures show the moment of impact as an Israeli missile hit a Beirut apartment block and exploded.
The block was one of five buildings destroyed by airstrikes on Friday alone.
Israel launched airstrikes in the southern suburbs of Beirut in a fourth consecutive day of intense attacks.
There were no immediate reports of casualties.
An Associated Press photographer captured a sequence of images showing an Israeli bomb approaching and hitting a multi-storey apartment building in Beirut’s Tayouneh area.
Richard Weir, a senior crisis, conflict and arms researcher at Human Rights Watch, reviewed the close-up photos to determine what type of weapon was used.
“The bomb and components visible in the photographs, including the strake, wire harness cover, and tail fin section, are consistent with a Mk-84 series 2,000-pound class general purpose bomb equipped with Boeing’s joint directed attack munition tail kit,” he told AP.
Deadly strikes as bombardment stepped up
Israel stepped up its bombardment this week – an escalation that has coincided with signs of movement in US-led diplomacy towards a ceasefire.
The Israeli military said its fighter jets attacked munitions warehouses, a headquarters and other Hezbollah infrastructure. It issued a warning on social media identifying buildings ahead of the strikes.
Meanwhile, an Israeli airstrike killed five members of the same family in a home in Ain Qana in the southern province of Nabatiyeh, Lebanon’s state media said.
The report said a mother, father and their three children were killed but didn’t provide their ages.
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Three other Israeli strikes killed six people and wounded 32 in different parts of Tyre province on Friday, also in south Lebanon, the report said.
Video footage also showed a building being struck and turning into a cloud of rubble and debris that billowed into Horsh Beirut, the city’s main park.
More than 3,200 people have been killed in Lebanon during 13 months of fighting between Israel and Hezbollah – most of them since mid-September.
About 27% of those killed were women and children, according to Lebanon’s health ministry.
Israel dramatically escalated its bombardment of Lebanon from September, vowing to cripple Hezbollah and end its barrages in Israel.
Friday’s strikes come as Lebanon’s caretaker prime minister has asked Iran to help secure a ceasefire in the war between Israel and Hezbollah.
The prime minister appeared to urge Ali Larijani, a top adviser to Iran’s supreme leader, Ali Khamenei, to convince the militant group to agree to a deal that could require it to pull back from the Israel-Lebanon border.
Iran is a main backer of Hezbollah and for decades has been funding and arming the Lebanese militant group.
On Thursday, Eli Cohen, Israel’s energy minister and a member of its security cabinet, said that prospects for a ceasefire with Lebanon were the most promising since the conflict began.
The Washington Post reported Israel’s Prime Minister Benjamin Netanyahu was rushing to advance a Lebanon ceasefire to deliver an early foreign policy win to his ally, US President-elect Donald Trump.
“Super high-IQ revolutionaries” who are willing to work 80+ hours a week are being urged to join Elon Musk’s new cost-cutting department in Donald Trump’s incoming US government.
The X and Tesla owner will co-lead the Department Of Government Efficiency (DOGE) with former Republican presidential candidate Vivek Ramaswamy.
In a reply to an interested party, Mr Musk suggested the lucky applicants would be working for free.
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“Indeed, this will be tedious work, make lost of enemies & compensation is zero,” the world’s richest man wrote.
“What a great deal!”
When announcing the new department, President-elect Donald Trump said Mr Musk and Mr Ramaswamy “will pave the way for my administration to dismantle government bureaucracy, slash excess regulations, cut wasteful expenditures, and restructure federal agencies”.
Mr Musk has previously made clear his desire to see cuts to “government waste” and in a post on his X platform suggested he could axe as many as three-quarters of the more than 400 federal departments in the US, writing: “99 is enough.”
At least 10 people have been killed after a fire broke out at a retirement home in northern Spain in the early hours of this morning, officials have said.
A further two people were seriously injured in the blaze at the residence in the town of Villafranca de Ebro in Zaragoza, according to the Spanish news website Diario Sur.
They remain in a critical condition, while several others received treatment for smoke inhalation.
Firefighters were alerted to the blaze at the residence – the Jardines de Villafranca – at 5am (4am UK time) on Friday.
Those who were killed in the fire died from smoke inhalation, Spanish newspaper Heraldo reported.