As a county court, they do not have jurisdiction to charge former President Trump with violating the Federal Election Campaign Act.
What they are trying to do is connect Trump to Cohen’s guilty plea of violating the Federal law based on his making the $130,000 payment, then convince the jury that it can be used as the underlying crime without Trump actually being convicted of the crime.
In looking at the Federal law, it appears that Trump had to reimburse Cohen or he would have been in violation of the law for accepting a prohibited campaign contribution.
Charge Trump with a crime.Then,Prove it....
It not,let him go...