In addition to the Mueller investigation, the Cohen investigation, and the Butina investigation (not to mention multiple state investigations), the Wall Street Journal first reported last night than a new avenue of investigation has opened up.
The Journal reports that federal prosecutors in New York are investigating Trump's inaugural committee and, more specifically, the record amount of money they raised and the shady ways they spent the money.
The criminal probe by the Manhattan U.S. attorney’s office, which is in its early stages, also is examining whether some of the committee’s top donors gave money in exchange for access to the incoming Trump administration, policy concessions or to influence official administration positions, some of the people said.
Giving money in exchange for political favors could run afoul of federal corruption laws. Diverting funds from the organization, which was registered as a nonprofit, could also violate federal law.
The information that led to this investigation was reportedly uncovered when federal agents raided the home and offices of Trump's former henchman Michael Cohen. Federal agents reportedly found a recording of Cohen speaking to one of Melania Trump's advisers who was apparently concerned about the inaugural committee's spending practices.
We don't know exactly what those concerns were, but federal prosecutors undoubtedly know much more than we do after spending dozens of hours interviewing Cohen.
This is yet another investigation that Trump could not bury by firing or replacing special prosecutor Robert Mueller. Information gathered under this investigation could be shared with Mueller's office, but it's not his investigation.
We can only speculate for now, but I would not be the least bit surprised if Saudi money was funneled through the inaugural committee.
Democrats haven't even taken control of oversight in Congress yet.