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David Cameron will chair his final cabinet meeting as prime minister later as Theresa May prepares to take over, the BBC reports.
Mrs May had been expecting a nine-week Conservative leadership race, but rival Andrea Leadsom withdrew on Monday.
Mr Cameron will tender his resignation to the Queen on Wednesday, leaving Mrs May, home secretary since 2010, to appoint her own ministerial team.
Mrs May said she was “honoured and humbled” to be taking over and pledged to make a success of the UK’s EU exit.