BETSY'S PAGE notes that both Carter's and Clinton AG's specifically claimed that the POTUS had CONSTITUTIONAL AUTHORITY as CiC to undertake search, seizure and surveillance of enemy foreign powers. She has linked quotes to back that up. She succinctly concludes:
... it has seemed commonsensical to me that, if the president has an inherent power under the Constitution, that a statute passed by Congress can't override that power. And Carter's Attorney General knew that at the time FISA was passed and, surely, after 9/11, the president's powers would not have decreased since 1978.
It seems to me that the OPERANT PRINCIPLE HERE IS REALLY RATHER QUITE SIMPLE: the Democrats and the Left believe president's inherent constitutional powers as CiC decrease whenever the White House is held by the GOP!