Labour leadership chatter intensified Sunday as Angela Rayner, the party’s deputy leader, is described by allies as having agreed to back Manchester mayor Andy Burnham’s bid to lead the party against Prime Minister Keir Starmer, in what one MP called a possible deal to restore her to the deputy prime minister post and a senior cabinet role if Burnham wins. The claims, relayed by several Labour MPs aligned with Burnham, are unverified and have drawn quick pushback from Burnham’s team, which has described discussions as