He is under indictment for... uhm, taking his own money out of his account in amounts our federal overlords do not approve of, and not telling the FBI why when asked. Note that this occurs while the Clinton openly are taking huge bribes while nothing is said.
In fact, this obscure law seems to be invoked as a gotcha today, for when the government want to a) take a citizen's money when no crime has been committed other than making deposits or withdrawals from your own bank account, or b) pursue a political opponent. For examples, google 'civil forfeiture abuse' and read a few stories for option a), and google 'Tom DeLay campaign finance trial' for option b).
What I cannot believe is that no one has played the go-to card of the day. The media is discussing this story based in the context of the Patriot Act expiring, and because he is Republican. No discussions about the blackmailer, or his possible crimes that led to the blackmail. No talk about motives or anything.