Boris Johnson has accepted he misled Parliament over Covid rule-breaking parties in Downing Street, but denies he did it on purpose.
The former Prime Minister has published a 50-page defence of his actions ahead of a grilling by MPs.
In it, he says his assurances to MPs that lockdown rules had been followed were made in good faith.
The privileges committee is expected to quiz him for several hours on Wednesday in a televised hearing.
The committee, chaired by veteran Labour MP Harriet Harman, but with a Tory majority, has previously said Mr Johnson may have misled Parliament on multiple occasions.