Subpoena time. Nancy can be found easily.
She sureneeds tobe
Clear evidence of intent. The actual event coordination now needs to be established.
Epps communication to his nephew taking full credit for coordinating the attack in the start of that discovery.
It may be the coordination of a culture of anti-Trump instead of an actual - factual plot where there is an established rank and file of those responsible. They are smart enough to know how to push the envelope without enough to secure a conviction on their plot. Plausible deniability.