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Boris Johnson's adviser on the ministerial code has resigned after the PM backed Home Secretary Priti Patel over a bullying inquiry.

The government's standards adviser Sir Alex Allan found that Ms Patel's behaviour had breached the code.

But Mr Johnson rejected Sir Alex's findings and said he had "full confidence" in Ms Patel.

Ms Patel released a statement saying she was sorry "that my behaviour in the past has upset people".

Ministers are normally expected to resign if they break the code and there are no known cases of a minister staying in post following a breach.

  • In full: Summary of Patel bullying report
  • Profile: Priti Patel

A government statement said Mr Johnson was "reassured that the home secretary is sorry for inadvertently upsetting those with whom she was working".

"He is also reassured that relationships, practices and culture in the Home Office are much improved," it said.

Sir Alex announced his resignation as the prime minister released his statement on the report's findings.

"I recognise that it is for the prime minister to make a judgement on whether actions by a minister amount to a breach of the ministerial code," he said.

"But I feel that it is right that I should now resign from my position as the prime minister's independent adviser on the code."