Furthermore..US v. Nixon is controlling constitutional law and Nixon lost his challenge. The court said
In U.S. vs. Nixon, the justices said there is a “general privilege of confidentiality of presidential communications” that has “constitutional underpinnings.” It was the first time the court had squarely recognized executive privilege. It is “fundamental to the operation of government and inextricably rooted in the separation of powers under the Constitution,” the justices said.
However, it is not “an absolute, unqualified presidential privilege of immunity,” they added. And most importantly, the president’s “generalized assertion of privilege must yield to the demonstrated, special need for evidence in a pending criminal trial.” Nixon was told he must turn over the tapes. He did so, and within two weeks, he had resigned.
In U.S. vs. Nixon, the justices said there is a “general privilege of confidentiality of presidential communications” that has “constitutional underpinnings.” It was the first time the court had squarely recognized executive privilege. It is “fundamental to the operation of government and inextricably rooted in the separation of powers under the Constitution,” the justices said.
However, it is not “an absolute, unqualified presidential privilege of immunity,” they added. And most importantly, the president’s “generalized assertion of privilege must yield to the demonstrated, special need for evidence in a pending criminal trial.” Nixon was told he must turn over the tapes. He did so, and within two weeks, he had resigned.