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18 October 2016, 12:00
James O'Brien put Sadiq Khan under the cosh in a tense exchange about the resignation of Met Police Commissioner Sir Bernard Hogan-Howe.
The Met Police chief announced his retirement last month, despite having previously said he wanted an extension to his current contract.
That led many commentators to say it was the new Mayor of London who wanted him out.
However, speaking on Speak To Sadiq, Mr Khan insisted that it was Sir Bernard's decision, but he struggled under James O'Brien's forensic questioning.
The Mayor of London said: "He decided that he did want to serve another four years and you've got to respect his decision. He's going at the end of February.
But James responded: "With respect, he'd previously made it pretty clear he was hoping to be in a job for longer. Very shortly after you becoming Mayor, the head of the Met is moving on."
When Mr Khan insisted he wanted Sir Bernard to stay, James then asked: "So you failed to hang on to him then?"
This exchange is a masterclass in questioning. Watch it in full above.