Rules are rules: Australian PM backs cancellation of Djokovic's visabr br Australian Prime Minister Scott Morrison says the same rules apply to all travellers and that Novak Djokovic couldn't provide evidence to support why he should be granted exemptions from vaccine mandates on international arrivals.br br Australia said Thursday it had cancelled the entry visa of Djokovic, opening the way to his detention and removal in a dramatic reversal for the tennis world number one.