It is not mandatory or a requirement to release tax forms...
As Trump said, tax forms do not show you a lot except that you either pay taxes or do not...If you don’t, the IRS will seize them...
Clinton said that all past presidents and candidates have released their tax forms...So what???
She also claimed he was hiding something. Here Trump should have responded “Well I wasn’t hiding 33,000 subpoenaed emails or any classified documents on an illegal server if that’s what you mean by hiding something. What does hiring somebody to clean your server , and I don’t mean with a cloth, to erase federal evidence of wrongdoing say about who’s hiding something.” He let several opportunities go like that.