Sir Keir Starmer has told the BBC he has a "duty" to stay on as prime minister as he justified his decisions on defence spending. Speaking the day after two of his defence ministers quit in a row over funding, Sir Keir insisted he had made "hard-edged" choices, including getting every department to make cuts to pay for defence. In a veiled warning to potential leadership challengers in his own party, he said: "Whoever is prime minister is going to face the same prevailing winds as I am facing,