Her exit comes at a difficult time for Musk who, in a brief reply, thanked her for her "contributions."
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Historical sexual abuse claims against former bishop and vicar investigated
Four people tell the BBC about abuse being ignored at the crisis-hit Church and call for inquiry.
Chris Mason: Reform's momentum is making the political weather
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The Papers: F1's Horner 'shunted out' and 'work doesn't pay'
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Ban some foreigners from sickness benefits, Tories urge
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Trump threatens Brazil with 50% tariff and demands Bolsonaro's trial end
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US sanctions UN expert Francesca Albanese, critic of Israel's Gaza offensive
Secretary of State Marco Rubio linked the move to her support for the International Criminal Court (ICC).
US sanctions UN expert Francesca Albanese, critic of Israel's Gaza offensive
Secretary of State Marco Rubio linked the move to her support for the International Criminal Court (ICC).
Watch: Trump praises Liberian president's English, the country's official language
Trump told Boakai he speaks "such good English", asking where he went to school.
Watch: Trump praises Liberian president's English, the country's official language
Trump told Boakai he speaks "such good English", asking where he went to school.
US lawmakers write to Canada to complain their wildfire smoke is spoiling summer
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Holidays to Spain, Cyprus and Turkey soar in price
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Monstrous PSG 'leading a new era' - but problems for Real Madrid
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Ex-Tory chairman Jake Berry defects to Reform UK
Earlier this week David Jones, the ex-Conservative Welsh secretary, also announced he had joined Nigel Farage's party.
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India cruise past England to clinch T20 series win
India clinch an historic T20 series victory over England with a comfortable six-wicket victory at Old Trafford.