You would need a constitutional amendment to create a new requirement for the presidency. Nice try at avoiding the point though, which is that you don't care to know if Trump is acting in his official duties in service of our interests or his own. I hope you never complain about government corruption in any way, ever, as you just showed you don't care.
It is a requirement for almost all other government employees, explicitly so we can see if they are corrupt.
lol.
At the State level (where I'm at) you have to complete a conflict of interest form if you are in a position of influence of, and/or purchasing goods and services, using state funding.
I'm fairly certain the same applies at the federal level
and on this form, EVERY ASSET YOU OWN is disclosed. Along with Creditor information.
And for some reason, Trump is exempt from this requirement. Or ANY President past or future.
As for tax returns, we need to see Trump's taxes period.