LONDON—Rishi Sunak, a former hedge-fund manager and U.K. Treasury chief, formally became Britain’s prime minister on Tuesday after he was appointed by King Charles III, vowing to steer the U.K. through a period of growing political and economic troubles.
In his first speech as prime minister, Mr. Sunak warned of a “profound economic crisis” facing the country, which is suffering from stagflation and has recently plunged into deeper political uncertainty with three different prime ministers in seven weeks.
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