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(CNN) --
British Prime Minister Boris Johnson will face a vote of confidence on Monday, promoted by disgruntled lawmakers from his own party.
Sir Graham Brady, chairman of the 1922 Committee, said in a statement on Monday that the number of Conservative Party MPs calling for the vote had reached the necessary threshold.
Voting will take place between 6 pm and 8 pm local time on Monday.
Boris Johnson's prime ministership has been rocked by the "Partygate" scandal, with months of allegations of parties and gatherings at the heart of his government during various stages of the pandemic lockdown eroding confidence in his leadership.
He has also been criticized for his response to the cost of living crisis.
Down, the approval of Boris Johnson
The prime minister's approval ratings have plummeted and there has been a growing sense among parts of the ruling Conservative Party that he is becoming a liability.
The party faces two difficult parliamentary by-elections later this month.
The PA news agency quoted a Downing Street spokesman as saying Boris Johnson "welcomes the opportunity to make his case to MPs".
In a sign of public discontent, the prime minister was booed by some members of the public on Friday as he arrived at London's St Paul's Cathedral for a service of thanksgiving for Queen Elizabeth II's Platinum Jubilee.
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Under Conservative Party rules, if MPs want to get rid of their leader, they send a confidential letter of no confidence to the chairman of the 1922 Committee, a group of minor lawmakers who do not hold government office.
The process is nebulous: the letters are kept secret and the president, Graham Brady, does not even reveal how many have been delivered.
When 15% of Conservative lawmakers have tabled letters, a confidence vote is triggered among all Conservative lawmakers.
CNN's Sharon Braithwaite contributed reporting.
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