He fingered the president as a co-conspirator to a federal crime.
Not really, this gets deep into the weeds of technicalities and legal maneuvering but lets just say those "campaign violations" were thrown in as requirements and wouldn't pass legal muster anywhere, but the tax evasion and shady business stuff most certainly would. So agree to doing this other fuzzy stuff, even if it's a stretch and we'll not hammer you *** to the wall on the hard stuff.
If Zerowone pleads guilty to helping Chanti murder someone, is that proof that Chanti murdered someone? People's intuition is to say yes, after all if Zero says its true then it must be. Yet legally the guilt of Chanti needs to be determined separately and Zero's plea itself can't be used as evidence. Instead Zero must show up and actually testify on precisely what was said and done, then undergo cross examination where the defense lawyer would point out that there is an awfully strong motivator for Zero to lie called prison. Instead Zero would be asked to tell the investigators where Chanti hid the bodies, and those bodies would be used.
That is why plea deals aren't used to get testimony nearly as much as Hollywood would have people think. They are used to get an easy win and to provide incentive for someone to provide evidence in an investigation. Someone would do a plea deal *and* agree to cooperate and provide information that would lead to another person's prosecution but not actual testimony since any defense lawyer would just say Zero is lying to keep himself out of jail, and people lie all the time to avoid jail. If someone's willing to lie on tax returns and bank statements to avoid jail time, why wouldn't' they also lie in court to avoid that same jail.
So far the most we have is a Democrat lawyer claiming hush money paid to porn stars for secret affairs is a "campaign contribution". Turn on daytime television and realize that if anything this just boosts Presidents Trumps ratings.