The district attorney who oversaw the case was a Republican, appointed by Donald Trump. Normally, when presidents change, all of the district attorneys resign so that the president can appoint their own people. However, in order to avoid the appearance of political interference, Biden kept the Republican DA who was investigating his son in place. Said DA charged Hunter Biden with a felony -- being an addict in possession of a firearm -- this is so rare that most prosecutors have never seen it charged, and the constitutionality of that charge is currently being contested in court...
by conservatives.
https://www.cato.org/blog/when-unlawful-user-controlled-substance-prohibited-having-gun
It's incredible how frequently Biden has done these corrupt things via i) Donald Trump's appointees, ii) Donald Trump's administration (half the things Os alleges didn't even happen while Biden was president), or iii) via Donald Trump his own damned self, as in Biden's conspiracy to trick Trump into loudly and repeatedly proclaiming his guilt. Truly, a puppet master for the ages (who is also senile somehow, don't ask questions, it isn't meant to make sense).