The program, launched after the terrorist attacks of Sept. 11, 2001, was ended by new agency Director Leon E. Panetta last month shortly after he learned about it and before it became operational. The investigation is aimed at determining whether CIA or other officials violated laws that require the executive branch to keep Congress fully informed of 'significant' intelligence activities. It opens a new front in the ongoing scrutiny of the agency's counterterrorism efforts under the Bush administration. Members of Congress didn't learn about the program until June 24, when Panetta arranged emergency briefings with the intelligence committees in both chambers. At the time, Panetta told lawmakers that Cheney had instructed the CIA not to share information about the program with Congress. Aides to Cheney have not responded to requests for comment. But former Bush administration officials have disputed characterizations of Cheney's involvement, saying that his comments came early in the program and that he merely encouraged the CIA not to discuss the effort until it was clear that it would go forward. CIA officials struggled for years to overcome legal and logistical obstacles, including who should be selected for the missions, where they would be trained and based, and how they might be extracted if they were successful. After shelving the program several times, agency officials revived the idea in recent years in hopes that the teams could also gather intelligence on the ground in Pakistan that could provide new clues to the whereabouts of Osama bin Laden and other al-Qaida leaders. The House probe comes at a time of intense political fighting on Capitol Hill over Bush-era counterterrorism measures. Earlier this year, House Speaker Nancy Pelosi, D-Calif., accused the CIA of misleading Congress about the brutal interrogation methods it had employed after the Sept. 11 attacks. Rep. Pete Hoekstra, R-Mich., the top Republican on the House committee, called the investigation a 'partisan plan' by Democrats to provide political cover for Pelosi. 'They are putting their partisan conclusions ahead of the facts,' Hoekstra said, noting that Director of National Intelligence Dennis Blair indicated earlier this week that he agreed there was no need to brief Congress on the program because it never got off the ground. CIA spokesman Paul Gimigliano noted that Committee Chairman Silvestre Reyes, D-Texas, had pledged to avoid allowing the investigation to become a 'distraction' to CIA employees, and said the agency would 'work closely with the committee on this review.' 