PROBABLE CAUSE is the standard for federal indictment - NOT "beyond a reasonable doubt" !!

So why did Mueller act like he had to have a "beyond a reasonable doubt" standard to bring a case or accuse of a crime?

How do prosecutors obtain federal indictments?

By law, a federal indictment can only be brought (or in technical terms “returned”) by a grand jury, which is a body of 16 to 23 citizens chosen from the community. The grand jury hears evidence and testimony from witnesses presented by the prosecution. It has the power to ask questions, and subpoena witnesses and documents on its own. Once the grand jury hears the evidence, it votes to indict or to not indict, based on whether there is “probable cause” to believe the defendant is guilty.