Trump was not the victim of political warfare. If anything Trump was a criminal hiding behind the immunity of the presidency to stay out of jail.
From Trump University, to the Trump charity closed down as criminal enterprises. And that was before Trump became president. And why Trump refused to release his tax returns. Because as you saw, once Trumps taxes were gone over, they found they were filled with fraud, As were his business records, and his loan applications.
The only reason Trump wasn't prosecuted earlier, is the IRS didn't have to audit his tax returns by law, until he was elected president.