Trump Tax Return

Mitt Romney said on 5/11/16:
“It is disqualifying for a modern-day presidential nominee to refuse to release tax returns to the voters.” “There is only one logical explanation for Mr. Trump's refusal to release his returns: there is a bombshell in them. Given Mr. Trump's equanimity with other flaws in his history, we can only assume it's a bombshell of unusual size.”
http://www.politico.com/story/2016/08/donald-trump-tax-returns

Since Trump said at a campaign rally on 1/23/16,
"I could stand in the middle of 5th Avenue and shoot somebody and I wouldn't lose voters", the real reason must be radioactive.
http://www.cnn.com/2016/01/23/politics/donald-trump-shoot-somebody-support

George Will speculates that
“Perhaps one more reason why we’re not seeing his tax returns is because he is deeply involved in dealing with Russia oligarchs and others.”
http://crooksandliars.com/2016/07/george-will-trump-wont-release-tax-returns

Mark Everson, IRS commissioner from 2003 to 2007 said, "It would be a real rupture in our political system," if a presidential candidate simply refused "to honor that transparency" and denied voters any chance to assess their taxes.
http://www.nbcnews.com/politics/2016-election/republican-ex-irs-commissioner-trump-should-release-taxes

Fred Goldberg, IRS commissioner from 1989 to 1992 and practicing tax lawyer, said on 8/23/16: "The sooner Trump releases his entire returns, the better." "Inevitably, his refusal to release his returns raises a question: What is Trump hiding?"
http://donny-t-rump.com/foolish-take-on-trumps-tax-return