A bipartisan group of senators is pushing legislation that would force the CIA to release an inspector general's report on the terrorist attacks of Sept. 11, 2001. The CIA has spent more than 20 months weighing requests under the Freedom of Information Act for its internal investigation of the attacks but has yet to release any portion of it. The agency is the only federal office involved in counterterrorism operations that has not made at least a version of its internal 9/11 investigation public. The law requires agencies to respond to requests within 20 days. Sen. Ron Wyden, D-Ore., and two other intelligence committee leaders -- chairman Jay Rockefeller, D-W.Va., and senior Republican Kit Bond of Missouri -- are pushing legislation that would require the agency to declassify the executive summary of the review within one month and submit a report to Congress explaining why any material was withheld. It's amazing the efforts the administration is going to stonewall this,'' Wyden said. "The American people have a right to know what the Central Intelligence Agency was doing in those critical months before 9/11.'' Completed in June 2005, the inspector general's report examined the personal responsibility of individuals at the CIA before and after the attacks. The CIA has not released any documents to The Associated Press or other organizations that began requesting the information at least 20 months ago. Groups including the National Security Archive have clashed with the agency over its FOIA policies. Last year, the archive gave the CIA its prize for the agency with the worst FOIA record. ''CIA has for three decades been one of the worst FOIA agencies,'' archive Director Thomas Blanton said this week.