From what I understand, it's a big violation of campaign finance laws, and it's what Michael Cohen already went to prison for. It's certainly not the worst of Trump's crimes, but it's weird that Cohen went to prison so quickly, but it took years before Trump himself was finally indicted. Surely if Cohen was guilty, then so was Trump?!

The entire impossibility of prosecuting Trump is weird to me. There's a host of crimes to pick from, from using/withholding already approved support for Ukraine to bribe/blackmail Zelensky for personal gain (dirt on a political opponent), to pressuring people to violate election laws, to instigating the January 6 attack on the Capitol, to keeping hundreds of highly classified documents in his basement and lying about it when he's requested to return them.

Lots of people have gone to prison much quicker for a fraction of this. So why is it so hard to prosecute a president or former president? It really feels like he is above the law, and lots of people want presidents to be above the law, apparently.