Former CIA Director David Petraeus has agreed to testify at a closed-door session of Congress to answer questions about September's terrorist attack on the U.S. consulate in Libya, but he will likely also be asked about new revelations that his alleged mistress Paula Broadwell is suspected of storing classified military material, at her home. Petraeus had been reluctant to testify following his resignation as CIA chief, but pressure had been growing in Congress for him to appear. "Gen. Petraeus is willing to come before the committee and the details are being worked out," Sen. Diane Feinstein, chairwoman of the Senate...