US Attorneys (Federal prosecutors) are appointed by the President for 4 year terms. Local State's Attorneys or District Attorneys are usually elected.

If a case is primarily being handled by the FBI, it's generally a Federal case being handled by a US Attorney.

And the President is elected every 4 years, and he is right at the center of political life in US. If the presidents wants to be elected again, we shouldn't be surprised if FBI and other parts of the executive branch are used to improve such odds. I would be more surprised perhaps if they are not used.

Is like some anthropological form of ice-9, but constructed out of flags, money and distilled stupidity.