(ROME)—Italian Premier Matteo Renzi announced he will resign Monday after suffering a stinging loss in a reforms referendum, triggering immediate calls from a populist party and other opposition forces for elections to be held soon. “The ‘No’s’ have won in an extraordinary clear-cut way,” Renzi told reporters in Rome about an hour after polls had closed in Sunday’s balloting. “I lost and the post that gets eliminated is mine,” Renzi said.