There was / IS a REASON Trump was THE FIRST POTUS since Nixon in '68 that did NOT RELEASE his tax returns voluntarily upon taking office. WONDER WHY ???
Same reason Trump payed $25 M (WHILE in OFFICE), to settle a class action law suit over his scam "Trump University", where he scammed students out of $60 M.
Same reason Nixon's DOJ charged him and Papa Trump for housing discrimination and fraud, to which they took a plea. 3 years later the Trumps were again charged by Ford's DOJ for the SAME offenses and AGAIN took a plea.
There is a LONG, SORDID track record of lawsuits suing Trump in Federal and State courts , going back to the 70s. ALL transgressions have been chronicled for decades by the Wall Street Journal, FORBES, Business Week, etc..
Same reason the vast majority of Trump's debt is held by Deutsche Bank in Germany, which is controlled by the Russian Mafia, (AGAIN well chronicled by the aforementioned business publications)--as Trump can't borrow any sizable amount from U.S. Banks due to repeatedly defaulting on loans , being sued ,then countersuing the banks in order to "NEGOTIATE" a LOWER settlement). Trump called it "good business". ANY HONEST man calls it being a CROOK.
ALL of the above transgressions, occurred prior to 2015 > NOTHING POLITICAL about ANY of it. All covered by the most conservative business publications in America and easily googled. WHO TRUMP IS, and ALWAYS HAS BEEN. There are a LOTTA really good men/women in the GOP. DJT AIN'T amongst them.