Does Spying on Congress Violate the Separation of Powers Principle?

Is NSA spying on Congress. Evidently yes. The Congressional Blackberries, used by congressmen and staff alike are serviced through both ATT and Verizon. A person identified as a senior Congressional staffer by Breibart states;

“I have grave concerns over the privacy of communications between staff and their member of Congress. All of our communications go through Verizon or ATT to reach our Blackberries." The staffer added, "Through a blanket seizing of these communications, the NSA is permanently intercepting and storing privileged material. This rasies further constitutional issues regarding separation of powers."

A Senate staffer concurred;

"Senators and staff all use Verizon phones. So the executive branch is monitoring the meta data of the Senate. This seems like a violation of the Speech and Debate Clause of the Constitution." 

Not to worry, says Obama;

Nobody is listening to your telephone calls

Correct it's only metadata. What difference would it make if the White House knew Congressman Darrell Issa called Victoria Nuland at home and then called David Petraeus at the Kitty Kat Lounge? And by the way where was NSA during the Weiner Twitter pic scandal?
In the video below Eric Holder has a hard time saying "no" to Senator Mark Kirk's question which essentially was, is NSA spying on Congress?