The Washington Post is going after Trump.  They are conducting an investigation into his taxes, especially the Trump Foundation, and the claims Trump has made concerning his charitable contributions.
This June 28th article only scratches the surface of what they found early on.
https://www.washingtonpost.com/poli...ab5d1a-37dd-11e6-8f7c-d4c723a2becb_story.html
Since then, they have found much more. A Washington Post representative was interviewed on OPB radio that was aired tonight.  They now believe they have found several irregularities that should be found to be tax evasion. And they believe there are many more.
The Post is going public because they are having a hard time finding any evidence for most of the contributions Trump claims he made.  They found one case where Trump claimed to be collecting contributions for a charity from other foundations, but had them make the contribution directly to him. Then Trump took the tax deduction using their money. The Post also believes this is why Trump will not release his tax returns. Too many irregularities that might get explained if they are made public.
There was a lot more tax irregularities explained on the radio show, but you get the idea. The Post is going after Trump hard.