Mr Johnson did not go through the proper channels in seeking to replace Sir Ian, the Home Secretary said. The Conservatives criticised her for continuing to support him.
Sir Ian, the country's most senior policeman, resigned on Thursday. He said that he could not continue in the role without the support of the Mayor.
Mr Johnson told Sir Ian the force needed new leadership during the Mayor's first day in the job of chairman of the Metropolitan Police Authority on Wednesday, it has emerged.
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