They still don't get it, part II

From the Congressional Research Service study:

it appears unlikely that a court would hold that Congress has expressly or impliedly authorized the NSA electronic surveillance operations here under discussion, and it would likewise appear that, to the extent that those surveillances fall within the definition of “electronic surveillance” within the meaning of FISA or any activity regulated under Title III, Congress intended to cover the entire field with these statutes. To the extent that the NSA activity is not permitted by some reading of Title III or FISA, it may represent an exercise of presidential power at its lowest ebb, in which case exclusive presidential control is sustainable only by “disabling Congress from acting upon the
subject.”

While courts have generally accepted that the President has the power to conduct domestic electronic surveillance within the United States inside the constraints of the Fourth Amendment, no court has held squarely that the Constitution disables the Congress from endeavoring to set limits on that power. To the contrary, the Supreme Court has stated that Congress does indeed have power to regulate domestic surveillance, and has not ruled on the extent to which Congress can act with respect to electronic surveillance to collect foreign intelligence information. Given such uncertainty, the Administration’s legal justification, as presented in the summary analysis from the Office of Legislative Affairs, does not seem to be as well-grounded as the tenor of that letter suggests.