The Central Intelligence Agency has said it does not spy on the Senate.
The comments from the CIA came as the Senate Intelligence Committee chairwoman accused the agency of blocking an investigation into interrogation practices and possibly violating the Constitution.
According to Politico, in an extraordinary speech on the Senate floor, Intelligence Committee Chairwoman Dianne Feinstein said CIA personnel illicitly snooped on Senate staffers by examining computers they used.
The spying by the CIA was part of a long-running review of the agency's treatment of terrorism suspects under President George W. Bush.
She said that the CIA's search might have violated the separation of powers principles embodied in the United States Constitution.
Feinstein added that the spying may have undermined the constitutional framework essential to effective congressional oversight of intelligence activities.
CIA Director John Brennan denied some of Feinstein's claims, saying that the allegation of CIA hacking into Senate computers, nothing could be further from the truth, the report added.