British opposition leader Keir Starmer on Sunday demanded a general election after three Conservative MPs, including Boris Johnson, resigned from parliament over the "Partygate" investigation, i.e. parties hosted by government headquarters in violation of health restrictions related to Covid-19.

Starmer, who leads the Labor Party, said in a tweet that Prime Minister Rishi Sunak should "call an election and let the public decide on 13 years of failure of the Conservative Party".

He added, "This farce must stop and people are tired of a corrupt Tory government and a weak Prime Minister who no one voted for."

On Friday, Johnson announced his resignation from Parliament in the wake of the parliamentary investigation into the "Party Gate" scandal.

Johnson, 58, confirmed that his decision takes effect immediately, which requires organizing by-elections that will put more political pressure on current Prime Minister Rishi Sunak.

A year after his exclusion from Downing Street at the initiative of the majority, following his three years in power that witnessed a series of scandals, Johnson remained subject to a parliamentary investigation to determine whether he had misled Parliament in the "Partygate" case.

A parliamentary inquiry committee must determine whether Johnson lied to Parliament when he repeatedly said that all health restrictions related to Covid were respected within the seat of British government.

"I am very sad to leave Parliament - at least for the time being - but above all I resent that I have been forced to leave in such an undemocratic way," Johnson said, accusing the committee of "egregious bias".

Boris Johnson's resignation will automatically lead to a by-election in his district in northwest London, where he won a majority of just a few thousand votes.

And one of his closest allies, former Culture Minister Nadine Dorris, who was still an MP, resigned, while another, Nigel Adams, resigned on Saturday.

Thus, there will be high-stakes local elections in three or more constituencies if Johnson's allies continue to resign.

Thus, Prime Minister Rishi Sunak, who has been in office since October, is facing electoral tests that appear to be difficult at a time when opinion polls show a significant decline for the conservatives after 13 years in power.

At the beginning of May, the Conservatives suffered huge losses in local elections in England.