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By Sam Francis & Henry Zeffman
BBC Politics
Rishi Sunak is facing calls to apologise for a jibe about Sir Keir Starmer's position on trans people at Prime Minister's Questions.
The PM ridiculed the Labour leader for U-turning on the "definition of a woman".
Sir Keir was visibly furious, saying: "Of all the weeks to say that when Brianna's mother is in this chamber".
Brianna Ghey's mother Esther was not in the public gallery for the exchange but entered later.
Mr Sunak said she represented "the very best of humanity" after a Labour MP called for an apology.
Reeling off a list of what he said were Labour U-turns, Mr Sunak said Sir Keir had changed his potion on "defining a woman - although in fairness, that was only 99% of a U-turn".
His comments, referred to an interview where Sir Keir had said "99.9% of women haven't got a penis".
Sir Keir hit back, saying: "Of all the weeks to say that, when Brianna's mother is in this chamber. Shame.
"Parading as a man of integrity when he's got absolutely no responsibility."
Ms Ghey was in the Houses of Parliament to attend a debate on mindfulness in schools, organised by her local MP Charlotte Nichols.