VP Nixon worked for President Eisenhower. The buck stops there. That said, I don't know what the definition of "outside" is, but there are intelligence committees that have oversight responsibilities for the CIA. They conduct all kinds of investigations and inquiries. Should they be privy to all information beyond a need to know? No.
My view: Nixon made his name with HUAC when it was popular, then blocked similar investigations when the Left made it controversial (and then unpopular). I am no fan of Nixon. Having said that, I appreciate your imput. Feel free to add to your comments because you are one of only a few that actually adds to my knowledgebase (on this topic)--HUAC
I'd be glad to send you some articles that shed light on the why and how of the "need" for outside investigation. Let me know--HUAC