Watch: Donald Trump calls Bitcoin 'scam' as Elon Musk faces threat by Anonymous

A day after industrialist Elon Musk faced apparent threats from a hacktivist group called 'Anonymous' over his comments on Bitcoin, a former US President spoke on the cryptocurrency. Donald Trump called the digital currency a 'scam' which is competing against the dollar. He said he wants the US dollar to be the currency of the world. A day earlier, Anonymous had said that Musk's crypto market 'games' had 'destroyed lives'. Watch the full video for more.