British Prime Minister Keir Starmer on Friday rejected the idea that he had lost authority in his role, and said he would fight to keep his job, adding that anyone who wanted to replace him would have to deal with the same financial constraints.The comments come a day after Defence Minister John Healey delivered a fresh blow to the prime minister’s already weakened leadership by quitting and accusing Starmer of being unable to commit the resources needed to keep the country safe, in a dig...