British Prime Minister Boris Johnson has received a questionnaire from London's Metropolitan Police as part of the investigation into parties in Downing Street during Covid-19 lockdowns, his office said, according to AP.

If he is found to have broken his government's own Covid-19 rules, the embattled prime minister could be fined and will face even more pressure to stand down from fellow lawmakers already furious at his proximity to the partygate affair.

A growing number of lawmakers from his own party are calling for his ouster, and even former leaders have lined up to warn him against attempting to cling to power if he is found to have broken rules.

Johnson has denied any wrongdoing, but he is alleged to have been at up to six of the 12 events in his 10 Downing Street office and other government buildings that are being investigated by the police.