Swift’s songs echo Mr Trump’s obsession with petty score-settling in their repeated references to her celebrity feuds, or report in painstaking detail on her failed romantic relationships (often, there is crossover). The message is quintessentially Trumpian: everyone is out to get me – but I win anyway. Seeded with clues to the identities of her famous associates, her lyrics reel in and solidify a hardcore fanbase – usually young, female followers known as “Swifties” – who passionately defend her honour on social media by attacking her detractors.

Mr Trump realised it was more effective to target a core group than attempt blanket appeal in his campaign – but Swift worked it out first. For years, she has directed her extraordinary self-promotional skills towards cultivating a dedicated and emotional army of followers, handpicking particularly loyal fans for private listening parties and, on her latest tour, allowing members of the public to buy tickets only once they have proved their allegiance through their purchasing history. Her new album, Reputation, is not available on Spotify – anyone wishing to hear it must buy it.