They are looking at campaign finance violations here. We don't know the details on this yet, but it sure seems like a violation.

Adult-film actress Stormy Daniels is reportedly cooperating with federal investigators looking into the $130,000 payment she received from President Trump's personal lawyer Michael Cohen.
NBC News first reported that Daniels was cooperating with investigators. Daniels's lawyer Michael Avenatti later tweeted out that he and his client would "fully cooperate with any search for the truth" relating to the $130,000 payment
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http://thehill.com/blogs/blog-briefi...mpression=true