(CNN) - Most of the Republican members of a Senate committee investigating the terrorist attack at the U.S. consulate in Benghazi, Libya, skipped a classified briefing by administration officials on the incident Wednesday, CNN has learned.

The missing lawmakers included Sen. John McCain of Arizona, who at the time of the top-secret briefing held a press conference in the Capitol to call for the creation of a Watergate-type special Congressional committee to investigate how and why the attack took place.

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