The former prime minister will appear before MPs on the Privileges Committee next week to defend himself over the partygate probe.
Ahead of that hearing on Wednesday 22 March, Mr Johnson’s legal team will hand over a dossier of written evidence to support his case that he did not mislead MPs over what he knew about lockdown-breaking parties in Downing Street, i understands.
Mr Johnson will be grilled by the committee of four Conservative, two Labour and one SNP MP, with questions led by Labour chairman Harriet Harman.
The eagerly awaited session is likely to make or break his chances of returning to the political frontline after being ousted by his own MPs last year.
Announcing the date of the hearing, the committee said it had also “invited Mr Johnson to provide written evidence to the inquiry setting out his response, should he wish, in advance of the oral evidence session. Any such response will be published”, adding: “The Committee has disclosed all evidence submitted to the inquiry so far to Mr Johnson under secure conditions.”
The ex-PM has agreed to submit a dossier of written evidence, it is understood.
Earlier this month the committee published a bombshell report on the evidence it said it has amassed so far over whether Mr Johnson knew lockdown-breaking parties were taking place.
The MPs said they believed the MP for Uxbridge and South Ruislip “may” have misled parliament in four different ways in December 2021 when he told the Commons that no rules had been broken.
WhatsApps published in the committee’s report included one from his then director of communications, Jack Doyle, that there was a “great gaping hole in the PM’s account”.
At the time of the report, Mr Johnson claimed the committee had failed to uncover any evidence that he had misled parliament and that he was sure “this process happily will vindicate me. I believed what we were doing was within the rules.”
The committee has insisted that their investigation is not based on Sue Gray’s inquiry into partygate but instead draws on evidence which includes WhatsApps, emails and photographs sent inside No10, handed over by the government in November after Mr Johnson had left Downing Street, and evidence from witnesses who were present at the time of the gatherings or at the time of preparation for Mr Johnson’s statement to parliament.
“Sue Gray was present at neither and is not one of those witnesses,” the committee said.
Witnesses have been asked to give evidence with a “statement of truth”, which is equivalent to giving evidence under oath.