Of course he won't

The entire reason that anyone pays any attention to Trump is because he plays a multi-billionaire on teevee. How do we know he is a multi-billionaire? Because Trump keeps telling us he is. When someone once wrote a book revealing that Trump was significantly less rich than he claimed to be, he sued the guy  because Trump knows that all he has is the perception of his obscene wealth. 

So of course he isn't going to reveal his tax returns  I wish the Democrats would make a big issue over the fact that Trump is a big fraud, and this refusal would be the best way to do it, but I'm not confident they will.