I think that the whole tax return demand from Hillary campaign to Trump is a scam. The IRS, according to reports, is still targeting conservatives and appears to acting as a political arm of the Obama administration. So, the Democrats demand the returns, Trump's lawyers advise that he can't release the returns and the IRS slow rolls the audit to give Hillary's campaign a talking point. If it is corrupt or dirty the Clintons will be at the bottom of it. IMO