The ruling Conservative Party in Britain will hold a no-confidence vote against Prime Minister Boris Johnson on Monday that could topple him as Britain's leader.

Party official "Graham Brady" said he had received enough messages from lawmakers demanding a vote on Johnson's leadership to trigger a vote, which will take place in the House of Commons on Monday evening.

If Johnson loses the vote among 359 Conservative MPs, he will be replaced as Conservative leader and Prime Minister. If he wins, he cannot face another challenge for a year.

Johnson has struggled to move on from months of ethical scandals, most notably regarding rule-breaking parties in government buildings during COVID-19 lockdowns.

Late last month, an investigator’s report on what became known as "Partygate" criticized the rule-breaking culture inside the Prime Minister’s Office at 10 Downing Street.

Civil Service investigator "Sue Gray" described the alcohol-fueled parties held by Downing Street staff in 2020 and 2021, when pandemic restrictions prevented UK residents from socializing or even visiting dying relatives.

Gray said the "senior leadership team" must take responsibility for "failures of leadership and governance." The Prime Minister said he felt "shame and embarrassment" and took "full responsibility" but insisted the time had now come "to move forward" and focus on Britain's battered economy and the war in Ukraine.

But an increasing number of Conservatives feel that Johnson, the charismatic leader who won them a large parliamentary majority in 2019, now represents a burden.

If Johnson is ousted, it will spark a competition for the Conservative leadership, with several senior government ministers likely to stand.

Conservative MP Roger Gale, a critic of Johnson, said, "We have some very good alternatives to the Prime Minister, so we are not far from choosing."

He told the BBC: "Any one of these people in my view would be a better Prime Minister than the one currently in office."

Discontent appears to have peaked over a parliamentary break that coincided with celebrations of Queen Elizabeth II’s Platinum Jubilee.

For many, the four-day weekend was a chance to relax — but there was no respite for Johnson, who was booed by some spectators upon arrival to attend a memorial mass for the Queen at St. Paul’s Cathedral on Friday.

Cabinet Minister Steve Barclay, an ally of Johnson, said removing the leader now was "indefensible." He wrote on the Conservative Home website: "The problems we face are not easy to solve."