It just means Sidney might be looking to prosecute members of government. "Hint hint Joe Biden“ as a special prosecutor for the DOJ. As a special prosecutor, you cannot be part of a legal team that represent a specific client. THEY REPRESENT THE PEOPLE, AND THE PEOPLE ONLY.

From Wiki:

Investigations into other persons connected to the government but not in a position of direct authority over the prosecutor, such as cabinet secretaries or election campaigns, have also been handled by special prosecutors.