Prime Minister Starmer has fended off calls for a public inquiry into Peter Mandelson's security vetting process, but only after expending significant political capital to keep Labour MPs on side. The row centered on Mandelson's appointment as a government minister despite past controversies, raising questions about how thoroughly the vetting procedure was conducted. Labour backbenchers pressed for a formal investigation into whether proper protocols were followed. Starmer resisted opening an inquiry, preferring to manage the controversy internally. His decision to hold the line came at a cost. Number 10 had to work actively to prevent Labour MPs from breaking ranks and supporting the inquiry demand. The episode illustrates the tightrope Starlem walks between maintaining party discipline and responding to legitimate concerns from his own members about ministerial appointments and transparency.