Again you are full of shit if you don't think Biden has been up to criminal shit with the crack baby. When he gets out of office he is fair game.
The constitution doesn't prevent charging criminals.
The Constitution most certainly prohibits baseless criminal investigations with the explicit goal being revenge. That's what you're advocating for, even if you lack the courage to admit it.
Because the obvious, and very glaring difference to Trump and Biden, is that we actually have evidence of Trump committing crimes. Take just one criminal case going on right now (out of the 91 charges your daddy is facing): Trump is sitting in a court room for violating campaign finance laws when he paid hush money to a porn star. And the evidence presented so far has included: 1) testimony from the owner of the tabloid who bought the story, killed it on orders by trump, and was paid by trump's lawyer (Cohen) to do so; 2) testimony from Cohen backing that story; 3) testimony from the porn star that she fucked trump and then the tabloid paid her to bury the story then bury it; 4) numerous financial statements showing payments from Cohen to the National Inquirer then him getting reimbursed by Trump; 5) numerous communications between Cohen and the tabloids about how they needed to kill these stories on behalf of trump.
And Trump's defense for all this, isn't go deny that he fucked Stormy (what a christian!) nor to deny that the National Inquirer was paid to kill stories about him fucking her and committing adultry (family values!). Trump's defense, and wait for it, is that Cohen just decided to kill this story out of the goodness of his own heart. So that money he paid to the tabloids was just his personal money. And Trump paying him back was for other stuff that they can't really remember. Therefore everything was above board and....
You see the difference? One guy, Trump, actually has evidence against him that he broke the law. The other, Biden, does not. You twats have done nothing in the House for the past three years, and have failed so spectacularly, that you've been reduced to promiting the testimony of russian spies while lying about the source until caught.
So no, you are not justified in launching criminal charges against politicians you don't like just because you back a criminal. And the Constitution, that you swore to uphold, does not have your back.