Sen. Dianne Feinstein, chairman of the Senate Intelligence Committee, is accusing the Central Intelligence Agency of conducting an illegal search of a congressional computer, removing documents, and searching a network at a CIA facility in Virginia.
"I have asked for an apology and a recognition that this CIA search of computers used by its oversight committee was inappropriate. I have received neither," Feinstein said from the Senate floor Tuesday.
Feinstein alleges the search was done as lawmakers were using that computer network in 2009 to look into the possible use of torture during terror investigations.
"I have grave concerns that the CIA's search may well have violated the separation of powers principle embodied in the United States Constitution," she said.
Feinstein also said the CIA is fighting a Justice Department investigation.
Republican Sen. Lindsey Graham has said if the charges are true, "people should go to jail."
CIA Director John Brennan quickly reacted to the charges Tuesday, calling the accusations baseless.
"Nothing could be further from the truth. I mean we wouldn't do that. I mean that's just beyond the, you know, the scope of reason," Brennan said in an interview with NBC News' Andrea Mitchell.
Brennan has also said the lawmakers will be proved wrong in this case.