(CNN) -- Sen. Dianne Feinstein is not a bomb thrower. As the head of the Senate Intelligence Committee she has, for instance, been a stalwart public defender of the National Security Agency's controversial bulk collection of phone data in the United States. That is why the verbal hand grenade she threw on the Senate floor on Tuesday is a device sufficiently explosive that it may represent the largest rupture between Congress and the CIA since the Church committee hearings of the mid-1970s, in which CIA officials were summoned to testify publicly about the agency's dirty tricks, such as its plan to assassinate Cuban dictator Fidel Castro.
@highlight
Sen. Feinstein accuses CIA of covertly removing documents from her staff's computers
@highlight
Bergen: Feinstein longtime CIA supporter, so her statements aren't easily dismissed
@highlight
Her staff's report disputes CIA claims that coercive interrogations yielded useful info
@highlight
Bergen: White House should step up and get summary of 6,000-page report released
Instead, the CIA learned of the existence of the courier, his true name and location through means unrelated to the @placeholder detention and interrogation program."