LONDON—A top aide to Boris Johnson who championed Brexit and was a driving force behind an antiestablishment turn by Britain’s Conservative Party is stepping down, in a sign of the waning influence of a group of advisers that worked to pull their country out of the European Union.
On Friday, the chief adviser to the prime minister, Dominic Cummings, who became known as a kind of British equivalent of President Trump’s former strategist Steve Bannon, said he would quit next month. His exit follows the resignation of Mr. Johnson’s main communications adviser, another leading Brexit campaigner.
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