Civil service bosses have told MPs that Lord Mandelson, who was sacked as UK ambassador to the US due to close links with convicted paedophile Jeffrey Epstein, was never formally interviewed for the job.
The head of the civil service, Sir Chris Wormald, said there was no interview because Lord Mandelson was directly appointed to the role.
MPs heard that process meant Lord Mandelson was not directly asked about any conflict of interest with interviewers in person, but instead needed to fill in a form aimed more at potential financial conflicts.
Sir Chris said this process has been changed since Lord Mandelson's exit, to ensure a formal, minuted interview happens.