But, George H.W. Bush appointed IRS commissioner Fred Goldberg wrote a column earlier this week explaining that an audit does not preclude Trump from disclosing his filings:

There is, however, a first step that Trump has no excuse for not taking. He can and should immediately release the first two pages of his Form 1040, along with his Schedule A, for the past 20 years. This would tell us how much he makes, how much he pays in taxes, and how much he contributes to charity.


Top House Republican calls on Donald Trump to release his tax returns - Salon.com