Answered

President Nixon claimed that _______ allowed him to keep phone calls secret.

Verified Answer :

The answer is executive privilege.  This is when the President and members of the
executive branch can defy subpoenas by legislative and judicial branches.
Presumption of privilege is use when privilege is qualified.  In Nixon’s case, he only declared a
generalized need for privilege but the court believed that the interest of
obtaining the truth needed priority.

Answer:

executive privilege

Explanation:

he said he had the power to protect the privacy of the conversation.