The last time Keir Starmer faced a threat to his leadership, his core team assembled in the cabinet room and persuaded ministers to fire off a succession of supportive tweets in an attempt to keep him in office. This time has been different. As the number of MPs calling for the prime minister to resign has grown over the last 48 hours, much of the cabinet has remained quiet. And though the prime minister remained in office on Tuesday night, some in government were wondering whether his political operation was as sharp as it once was, especially since the departure of Starmer’s long-term aide Morgan McSweeney. “How could they not plan for this, it’s mad,” said one MP, frustrated at what they saw as a lack of fightback from Downing Street. Another said there was “literally no guidance or plan.…