Four members of Congress met in secret for a first look at a unique CIA program designed to wring vital information from reticent terrorism suspects in U.S. custody. For more than an hour, the bipartisan group, which included current House Speaker Nancy Pelosi (D-Calif.), was given a virtual tour of the CIA's overseas detention sites and the harsh techniques interrogators had devised to try to make their prisoners talk.

Among the techniques described, said two officials present, was waterboarding, a practice that years later would be condemned as torture by Democrats and some Republicans on Capitol Hill. But on that day, no objections were raised. Instead, at least two lawmakers in the room asked the CIA to push harder, two U.S. officials said.

"The briefer was specifically asked if the methods were tough enough," said a U.S. official who witnessed the exchange...

The CIA gave key legislative overseers about 30 private briefings, some of which included descriptions of that technique and other harsh interrogation methods, according to interviews with multiple U.S. officials with firsthand knowledge. With one known exception, no formal objections were raised by the lawmakers briefed about the harsh methods during the two years in which waterboarding was employed, from 2002 to 2003, said Democrats and Republicans with direct knowledge of the matter. The lawmakers who held oversight roles during the period included Pelosi...

"Among those being briefed, there was a pretty full understanding of what the CIA was doing," said Goss, who chaired the House intelligence committee from 1997 to 2004 and then served as CIA director from 2004 to 2006. "And the reaction in the room was not just approval, but encouragement."...

Abu Zubaida, the first of the "high-value" detainees in CIA custody, was subjected to harsh interrogation methods beginning in spring 2002 after he refused to cooperate with questioners, the officials said. CIA briefers gave the four intelligence committee members limited information about Abu Zubaida's detention in spring 2002, but offered a more detailed account of its interrogation practices in September of that year, said officials with direct knowledge of the briefings.

The CIA provided another briefing the following month, and then about 28 additional briefings over five years, said three U.S. officials with firsthand knowledge of the meetings. During these sessions, the agency provided information about the techniques it was using as well as the information it collected.

Given these facts, how plausible is Pelosi's claimed ignorance?