British Prime Minister Keir Starmer was reflecting this weekend on the “political realities” that he faces, a senior minister said on Sunday, amid media reports the premier would resign within days. It follows veteran Labour politician and rival Andy Burnham’s victory in a by-election on Friday, which paves the way for the 56-year-old to challenge the beleaguered Starmer to be party leader and prime minister. Any Labour leadership candidate must be a member of parliament.