What happens when a British Prime Minister resigns?
Boris Johnson quits as UK lawmaker after learning he will be sanctioned over 'partygate' - India Today
Boris Johnson: UK Prime Minister resigns after mutiny in his party
Who could replace Boris Johnson as UK prime minister?
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Premiership of Boris Johnson - Wikipedia
Boris Johnson announces he's standing down as MP in scathing statement insisting 'I did NOT lie
On Brexit Mission, Britain's Boris Johnson Takes Office Of Prime Minister
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Explained: Can Boris Johnson be forced out, and how is a successor chosen?