The prime minister tried to turn his disagreement with the US president to his advantage in the Commons, writes John Rentoul T his is a moment of “profound national seriousness”, said Kemi Badenoch at Prime Minister’s Questions. Never mind that she had just made a joke about a Labour MP bringing sex toys into parliament, she is right. Keir Starmer, who thinks of himself as a serious person for serious times, is being undermined by an American president who is shockingly unserious but doing