The SNP leadership contest has descended into a “squabble”, Sir Keir Starmer said after two candidates raised concerns about election integrity. The leadership campaigns of Kate Forbes and Ash Regan have called for independent auditors to oversee the process, while the third candidate, Humza Yousaf, dismissed their calls as “baseless smears”. Labour leader Sir Keir was asked about the contest to replace First Minister Nicola Sturgeon as he visited the biotech company Roslin CT in Edinburgh on Thursday.