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The ‘Darwinian’ System to Select UK’s Prime Minister

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UK's Johnson Resigns as Prime Minister, Says He'll Stay on as Caretaker
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When he resigned as British Prime Minister, Boris Johnson sought to reassure the country that its “brilliant and Darwinian system” could be trusted to select his successor. Filling the post falls to his Conservative Party, since traditionally the head of the biggest party in Parliament also holds the top job in government. A crowded field of candidates compete for support and undergo successive selection rounds involving fellow-Tory lawmakers and finally rank-and-file party members.