Just over 18 months ago, Keir Starmer said the “fight for trust is the battle that defines our age”. Now a scandal surrounding his former ambassador to Washington, Peter Mandelson, could end his political career, precisely because of the damage it could cause to public trust.

At the heart of the story are documents released by the US government showing that Mandelson continued to be friends with Jeffrey Epstein after his conviction for sex offences. The prime minister insists Mandelson lied about the depth of his friendship with Epstein, though he has acknowledged he knew that it continued after Epstein’s conviction.

Some reporting suggests that there was a view in Downing Street that the “risk” of appointing Mandelson as ambassador to the US – his past political career, his then publicly known relationship with Epstein – was less important than the benefit to the national interest. As Peter Kyle, secretary of state for business and trade, put it in September (before further files were released): “Britain needed someone with outstanding and singular talents”.

This implies a specific view of how politicians should behave. When the national interest is at stake, actions are acceptable that would otherwise be morally questionable. Some politicians seem to think political effectiveness can outweigh standards. Philosophers sometimes agree that politics makes “dirty hands” unavoidable. Machiavelli thought politicians should learn not to be good. To achieve important political ends, it can be necessary to act........

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