At a glance: Starmer fights to stay on as prime minister PA Media Sir Keir Starmer is fighting to stay on as prime minister, as he stares down calls from Labour critics for him to leave Downing Street. On Thursday, Wes Streeting resigned from the cabinet, leaving his post as health secretary - although he stopped short of launching a leadership bid. Earlier in the week, four members of the government, including health minister and Streeting ally Zubir Ahmed, resigned, while scores of Labour MPs are calling for Sir Keir to quit following a disastrous set of elections for the party last week. Here is a summary of what is happening. What's the latest?…