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Apparently, Boris had been answering questions from the British journalists present.
That was considered to have set a dangerous precedent, so the President's 'minders' did a pre-emptive strike to ward off any non pre-prepared questions.
The journalists have put in an official complaint of some sort.
Those of you who think it would be an act of kindness (as I do) to put Biden out to grass probably haven't got long to wait. All those journos have been running cover for Biden for well over a year. If, as it seems, they've turned on him, it's because they've been ordered to.
President *** Harris, can't wait. ;-(