Q:

How would a trial occur if two political bodies investigate the same crime?

Background
In the United States, there is plentiful news of investigations of high profile people.  In particular, some issues, like the Hillary Clinton Email Scandal have resulted in investigations from multiple political bodies.
Notwithstanding opinions on validity of an investigation or opinions on the issue I cited at hand, I was wondering about the following situation. Say two investigations, one from the Department of State and one from the DOJ, both organizations which are federal and operate under the same executive branch of the United States, determine someone is guilty and come up with an identical set of charges. These investigations are independent and have inherently different processes for handling things.
Question
How would a trial proceed upon conclusion of these investigations, so as to prevent things like double jeopardy?

A:

For a trial to occur, a US Attorney needs to file a charging document with a court. The attorney in question can do that either on instructions from the Department of Justice or if he or she determines that the facts presented in the whatever report the organization compiled and published confirm that the crime has been commited. The trial would proceed in the court of law in the normal matter. Mere publication of the report by any organization does not automatically charge the person with any crimes - no matter what charges the report alleges.
If the same person is indicted on the same charges in different US courts, normal Double Jeopardy clause applies:

Jeopardy attaches in jury trial when the jury is empaneled and sworn in, in a bench trial when the court begins to hear evidence after the first witness is sworn in, or when a court accepts a defendant's plea unconditionally.

