It should be pointed out that the headline misrepresents the content. Will did not say that the returns would show Russian ties - he said they might show Russian ties. That a rather critical distinction that the headline writer apparently ignored. Here's the actual quote from the story:
Will replied that "it's the sort of thing we might learn if we saw the candidate's tax returns," which Trump has resisted making public. "Perhaps one more reason why we're not seeing his tax returns — because he is deeply involved in dealing with Russian oligarchs and others. Whether that's good, bad or indifferent, it's probably the reasonable surmise."
Will isn't stating a fact -- he's offering a pure opinion that has somehow become the basis for "Trump is lying". He's muckracking/poop-stirring, etc., without any actual evidence.
There are plenty of well-vetted criticisms of Trump, including plenty of stupid things that have come out of his own mouth, that people shouldn't have to make-up/misrepresent facts to attack the guy.
