NewsElections Billionaires on Donald Trump: What the wealthy have said about the Republican nominee By Nicole Brown email@example.com Updated August 10, 2016 2:34 PM Print Share fbShare Tweet Email Donald Trump's fellow billionaires are not all in his camp. Some of them have spoken very clearly against the Republican nominee and have instead expressed support for Democratic nominee Hillary Clinton. Billionaire investor Carl Icahn is one who has not been critical of Trump, and the nominee even invited him to be one of his economic advisers. Icahn turned down the offer, but has still shown support for Trump. Here's what Icahn and other billionaires have said about the real estate mogul. Warren Buffet Photo Credit: Getty Images / Alex Wong Speaking at a rally for Hillary Clinton in Omaha, Nebraska, in early August, Warren Buffett challenged Trump to show his tax return to the public. "I would be delighted to meet him any place, any time between now and election. I'll bring my tax return. He can bring his tax return," he said "And just let people ask us questions about items on there." The CEO of Berkshire Hathaway also attacked Trump's business, saying he's never known anyone else to brag about bankruptcies, and questioned how the Republican nominee could say he has made sacrifices in his life. "How in the world can you stand up to a couple of parents who've lost a son and talk about sacrificing because you were building a bunch of buildings?" Buffet said referring to the parents of U.S. Army Capt. Humayan Khan, who died serving in Iraq in 2014. Carl Icahn Photo Credit: Getty Images / Neilson Barnard Investor Carl Icahn said Trump is "right on about the economy." In an interview on CNBC, he said, "We have a massive problem and Donald is addressing it. The Democrats are not ... and if he sticks to that economic theme, he should definitely win hands down because I don't know why you wouldn't vote for him." Koch Brothers Photo Credit: Getty Images / Astrid Stawiarz David (pictured above) and Charles Koch, who have been known to support Republican candidates with campaign contributions in the past, have said their money may be better spent in congressional races. "At this point, I can't support either candidate," Charles said, speaking about the presidential election in July. Bill Gates Photo Credit: Getty Images / JP Yim When Bill Gates announced additions to the list of individuals who have signed the Giving Pledge, an agreement to donate a majority of ones wealth to charity, in June, Trump was not on the list. When asked about Trump, Gates said, "Donald hasn't been known for his philanthropy. He's been known for other things." Michael Bloomberg Photo Credit: AFP / Getty Images / Robyn Beck Former New York City Mayor Michael Bloomberg is not impressed with Trump's past as a businessman. "Trump says he wants to run the country like he runs his businesses? God help us," he said in his DNC speech in July. In the speech, he also called Trump a "dangerous demagogue" and attacked how he became wealthy. "I've built a business, and I didn't start it with a million-dollar check from my father." Mark Zuckerberg Photo Credit: Getty Images / David Ramos Without directly mentioning Trump, Facebook CEO Mark Zuckerberg made his opinion of the Republican nominee clear in a speech at the annual F8 developer conference in April. "I hear fearful voices calling for building walls and distancing people they label as others," he said. "Instead of building walls, we can help people build bridges. And instead of dividing people, we can help bring people together." By Nicole Brown firstname.lastname@example.org Share on Facebook Share on Twitter Comments We're revamping our Comments section. Learn more and share your input.