It's not clear they're even pursuing him for a real crime.
Paying for a paramour's silence?
At best I've seen that it might've been treated as a
deductable business expense....technically a crime,
but generally just the IRS levying taxes & penalties.
If they don't go after him for the real crime of
fomenting insurrection, then it's just political
harassment. Moreover, it's highly hypocritcial,
given that they ignored Clinton's perjury before
a grand jury, suborning perjury, & selling pardons.
Democrats...when they aren't being useless, they're
being corrupt. (Pubs aren't any better.)