It shall be unlawful for [the President] to request, directly or indirectly, any officer or employee of the Internal Revenue Service to conduct or terminate an audit or other investigation of any particular taxpayer with respect to the tax liability of such taxpayer.
[…]
Any person who willfully violates subsection (a) or fails to report under subsection (b) shall be punished upon conviction by a fine in any amount not exceeding $5,000, or imprisonment of not more than 5 years, or both, together with the costs of prosecution.
26 U.S. Code § 7217
Counterpoint: ‘When the president does it, that means it is not illegal’ now has the weight of SCOTUS behind it. :/
And Trump has proven it means fuck all.