What happens if Trump is found guilty of violating campaign finance laws?

The Wall Street Journal reports that federal prosecutors have evidence that Trump was directly involved in payouts to adult film star Stormy Daniels and Playboy playmate Karen McDougal. Those payments happened just before the 2016 election, meaning they could be a violation of campaign finance laws. The paper’s story refutes Trump’s denials that he knew nothing about those payments. House Democrats say they plan to investigate when they take over next year.