Senate Majority Leader Harry M. Reid (D-Nev.) has escalated congressional concerns with alleged interference by the CIA in a Senate Intelligence Committee investigation by asking the Senate’s top law enforcement official to review computers used by committee staffers to investigate the agency’s controversial interrogation program.

Reid’s request comes as aides say he has grown convinced that the CIA overstepped its authority by attempting to interfere in the committee’s investigation into the interrogation program, the results of which may be released in the coming weeks. Sen. Dianne Feinstein (D-Calif.), who leads the intelligence panel, first publicly accused the CIA of interfering in her investigation during a dramatic Senate floor speech last week.

Reid sent a letter to CIA Director John O. Brennan late Wednesday stating that he has asked the Senate Sergeant at Arms to review the computers used by committee investigators and asked that he grant proper security clearances and access to the computers. As part of the committee probe, the CIA set up a secret facility in Northern Virginia with computers where investigators were promised unfettered access to millions of documents describing the interrogation program.