WASHINGTON (AP) -- Senators are readying for a big vote this week on whether to release key sections of a report on terrorism interrogations.

If the material is made public, it would start a declassification process that could further test the already strained relationship between lawmakers and the CIA and force President Barack Obama into the fray.

The Senate Intelligence Committee hopes that publishing a 400-page summary of its review and 20 key recommendations will shed light on some of the most unsavory elements of the Bush administration's terrorism-fighting tools after the Sept. 11 attacks.

The CIA says the report underestimates the intelligence value of waterboarding and other methods employed by intelligence officials at undeclared facilities overseas.