NEW: "There are multiple viable grand jury investigations, including a far-reaching investigation in Fort Pierce that includes 'issues at Mar-a-Lago and beyond' into whether President Trump had his civil rights violated. There continued to be an additional investigation relating only to [John] Brennan’s statements before Congress in the District of Columbia. Brennan was a 'target' of the narrower investigation, and the investigation for which he was now being subpoenaed was the 'more wide-ranging conspiracy,' as to which our client was a 'subject.' The narrower investigation was 'still viable,' and the issues in the narrower investigation might also be part of the larger investigation, such as being overt acts," according to new court disclosures by Brennan's attorney.