Donald Trump's abrasive, longshot campaign for the Republican nomination for president is looking less unrealistic after big wins in early primaries in New Hampshire and South Carolina. So far he's had to spend only $18 million of his $4.5 billion fortune on his run (in all, his campaign has raised just $25 million). Trump has stirred controversy, starting with negative remarks in June 2015 about Mexican immigrants and his call to build a wall between Mexico and the U.S. and force Mexico to pay for it. He followed with a plan in August to deport more than 11 million illegal immigrants from the U.S. Trump alienated some women voters with a critical remark about Republican presidential candidate Carly Fiorina's looks. He insulted Sen. John McCain's military record. Despite such gaffes, he still polls well. Trump and Forbes have disagreed about his net worth for 32 years. In September 2015 Forbes pegged his net worth at $4.5 billion; Trump claimed he's worth $10 billion or more, $3 billion of which is the value of his "brand." Trump admitted to Forbes in September that the magazine had listed his net worth "too high" in the early years on The Forbes 400 list -- and that in turn it helped him secure financing.