In a packed auditorium steps from the Vatican, Roberto Vannacci – the former Italian army general known to supporters as ‘Il Generale’ – is rallying followers of his fledgling party, casting himself as an outsider while reshaping Italy’s right and challenging Prime Minister Giorgia Meloni, a close ally of US President Donald Trump. Vannacci’s fast-rising “Futuro Nazionale” party is injecting new uncertainty into the conservative bloc that has underpinned Meloni’s government, exposing tensions...