Christian Horner has reportedly been asked to ‘voluntarily resign’ as Red Bull team principal over allegations of ‘controlling behaviour’ made by an employee. The F1 chief is under investigation at Red Bull after it emerged that an employee had raised complaints against him for ‘inappropriate behaviour’. Horner has strongly denied the accusations against him, stating: “I completely deny these claims.” But Motorsport-total claim Horner the 50-year-old has been ‘advised to voluntarily resign’ in wake of the accusations. The report goes on to claim Horner likely rejected the request to resign in …