Donald Trump is the first presidential candidate in decades to refuse to release his tax returns, and actual billionaire and successful businessperson Warren Buffett thinks that's because "he's afraid." Speaking in Buffett's hometown of Omaha, the founder of Berkshire Hathaway endorsed Clinton and rejected the Donald's excuse that being under audit was a valid reason not to release:

"I've got news for him, I'm under audit too. I would be delighted to meet him any time, any place before the election. There are no rules against showing your tax returns and just let[ting] people ask questions about the items that are on there. ...How many of you would be afraid to have your tax return made public? You're only afraid if you got something to be afraid about. He's not afraid of the IRS. He's afraid because of you."

Sources: Politico