He can't help being defensive. He can't help his feelings for Putin and his love for the mother country Russia. OR he is in bed with Russia/Putin financially and is terrified that releasing his tax returns will show us that entanglement. He would rather sound foolish,ignorant, hostile,combative, cantankerous than have we the people find out just exactly how tied up with Russia/Putin he has been for how many years. So I guess we can't blame Trump for wanting to save his a**. Now can we? If he doesn't do it who will?