Former minister Tobias Ellwood denies he breached any Covid rules by attending the event on the eve of London moving into tier 3.
The prime minister might need to rely on Labour votes to get the new rules approved.
The prime minister faces a backlash from Tory MPs over his move to change the Withdrawal Agreement signed with the EU.
Andrew Banks, from Stansted, will appear at Westminster Magistrates' Court on Monday.
Tory MP Tobias Ellwood – who gave Palmer first aid after the Westminster terror attack – called the image 'abhorrent'.
The government is looking at its options as an audio recording emerges of the moments HMS Montrose was seized in the Strait of Hormuz.
Breakaway party's backing could prove crucial as some Tories signal willingness to collapse government to stop no deal.
Tory leadership frontrunner avoids scrutiny as other candidates scrap for second place.
The five things you need to know about politics today
Tobias Ellwood closed PC Keith Palmer's eyes and told him: "I'm sorry."