Long before he was a contender for the US presidency, Donald Trump was America's most famous and colourful billionaire.Once considered a long shot, the 74-year-old is now president of the United States, approaching the end of a four-year term.Scepticism over his candidacy for the 2016 election had stemmed not only from his controversial platform on immigration and outrageous campaign-style but from his celebrity past.Yet the businessman had the last...