I think you'd be far better pursuing the issue of him not creating a true blind trust when he became president. That shows conflict of interest. I don't know what his taxes are supposed to show that would prove conflict.
I assume you mean other than business dealings with and debts to foreign organizations with whom he now makes decisions worth hundreds of billions of dollars for those entities.
i don't know much about taxes. Taxes show business dealings, I know. They also show debts? Do they show debts being erased without payment too? That could be useful if it is there.