Congress too often forgets that the courts are not self-created. They did not create themselves, nor are they Creations of the Constitution other than the Supreme Court. They are all created by Congress and none more specifically a Congressional creation than the FISA court. As such they are just as subject to Congressional oversight, and transparency with Congress, as are the executive branch agencies Congress created. If Congress was REALLY doing its duty it would have used its political authority long ago and impeached numerous judges throughout U.S. history.
You say - well the Constitution did not define “bad behavior” (though some say there are “understandings” of what it once meant) - which means that term can, politically, be left to Congress when it comes to its judging of judges. Like it or not, it is only Congress constant abdication of its own powers that has made the executive and judiciary dominant over it.
BUMP!
The public would be pissed if it knew how much of its communication was "snooped" without a warrant.
The only remedy for 4th amendment violations is evidence tossed from a criminal case. The criminal and civil penalties are totally toothless.