Billionaire Elon Musk has said he is leaving his role in the US government, in which he was tasked with reducing federal spending, shortly after his first major break with Donald Trump over the president's signature spending bill. While classified as a "special government employee" and "senior advisor to the president," the South African-born tycoon has left indelible marks on American politics as Trump's most visible backer. - The 'Nazi' salute - AFP Musk's gesture -- which he repeated -- led to critics calling Tesla vehicles 'swasticars' Being Trump's right-hand man took on a new meaning when the world's richest...