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In a letter released by the State Department Tuesday evening, Mr. Pickering told House Oversight and Government Reform Committee Chairman Rep. Darrell E. Issa, California Republican, that he and the board’s vice chairman, Adm. Mike Mullen, former chairman of the Joint Chiefs of Staff, “would welcome the opportunity to testify publicly before the committee and to answer any questions you might have.”

In his reply, Mr. Issa requested that both men submit to a transcribed interview with committee staff prior to public testimony. Mr. Issa said Mr. Pickering had assured him over the weekend that Mr. Pickering would voluntarily submit to such an interview.

Mr. Pickering’s letter does not mention the request for a transcribed interview.

“We have agreed to appear at open public hearings,” Mr. Pickering said when asked whether the two men would submit to transcribed interviews. “So that’s our answer.”