Is the CIA blackmailing US senators?

Why else would the CIA  spy on them?  Some of the actions and decisions coming from the US Congress are so bizzaro world, one can make a good case that a large contingent of the US govt body is either blackmailed or powerful A1 type hypnotists have them under their spell and making them sign their names to the most outrageous actions they normally wouldn't have.

Spencer Ackerman  writing at TheGuardianUK:
CIA admits to spying on Senate staffers   
CIA director apologises for improper conduct of agency staff
One senator calls on John Brennan to resign in wake of scandal
The director of the Central Intelligence Agency, John Brennan, issued an extraordinary apology to leaders of the US Senate intelligence committee on Thursday, conceding that the agency employees spied on committee staff and reversing months of furious and public denials.



Brennan acknowledged that an internal investigation had found agency security personnel transgressed a firewall set up on a CIA network, which allowed Senate committee investigators to review agency documents for their landmark inquiry into CIA torture.

Among other things, it was revealed that agency officials conducted keyword searches and email searches on committee staff while they used the network.

The admission brings Brennan’s already rocky tenure at the head of the CIA under renewed question. One senator on the panel said he had lost confidence in the director, although the White House indicated its support for a man who has been one of Barack Obama’s most trusted security aides.

CIA spokesman Dean Boyd acknowledged that agency staff had improperly monitored the computers of committee staff members, who were using a network the agency had set up, called RDINet. “Some CIA employees acted in a manner inconsistent with the common understanding reached between [the committee] and the CIA in 2009 regarding access to the RDINet,” he said.
Asked if Brennan had or would offer his resignation, a different CIA spokesman, Ryan Trapani, replied: “No.”

In March, the committee chairwoman, Senator Dianne Feinstein of California, accused the agency of violating constitutional boundaries by spying on the Senate.
Feinstein said the vindication, from CIA inspector general David Buckley, and Brennan’s apology were “positive first steps,” suggesting that the director had further work to do before she would consider the matter closed............