I thought it was a violation of law to disclose someone else’s tax return.
High security clearances require reporting Financial information on several forms associated with the package that is submitted to OPM for determination and adjudication.
Tax information provided by previous presidents as always voluntarily given by those particular presidents. It is not necessary, it is not unlawful to not provide voluntarily.
I think the Democrats just want be nosey.
During criminal investigations I’m sure the FBI are able to access tax information.
Besides, if there was a tax problem the IRS is there to deal with the tax problem with the individual directly.