What to know: New York City federal prosecutors wrote up an 80-page draft indictment in August to be used against Trump's former personal lawyer Michael Cohen, which outlined Cohen's coordination with undisclosed Trump campaign members via phone calls and meetings about the payments to women claiming sexual relationships. Sources familiar with the document told the Wall Street Journal that the unnamed campaign member was Trump himself.

How he did it:

• In 2015, Trump asked American Media CEO Pecker to help him with his campaign. Pecker offered to use the National Enquirer to silence women who claim to have had sexual relationships with Trump, according to WSJ. He eventually paid $150,000 to model Karen McDougal, who claimed to have had an affair with Trump years before.
• Cohen has also reportedly told prosecutors that he discussed with Trump the payments to former porn star Stormy Daniels in the weeks leading up to it, and how to ensure it could not be traced back to the then-presidential candidate.

The bottom line: In order to be guilty of federal campaign finance crimes, Trump would have had to used more than $2,700 worth of campaign contributions from companies or individuals in these payments, Richard Hasen, a law professor at the University of California, told WSJ.