You being unaware of the law doesn’t make it legal. It hasn’t been prosecuted against Trump because he’s the President. Cohen went to jail, he wasn’t the President. I’m sure there’s no source you’ll find credible. I’ll provide one from Fortune Magazine. Feel free to Google, “Individual 1” and see what you get from any other source.

https://fortune.com/2018/12/07/feds-accuse-trump-crime-cohen-campaign-finance/