Chairman Trey Gowdy knew about Clinton’s secret server six months ago, and that too is a scandal. In assessing the Benghazi select committee headed up by Chairman Trey Gowdy (R., S.C.), there are two possibilities, and they are not mutually exclusive: (1) The committee is just a Potemkin probe erected by the Republican establishment to get restive conservatives to pipe down, and (2) the committee is incompetent. The panel, of course, was commissioned by the Republican-controlled House to investigate the circumstances surrounding the September 11, 2012, attack in which al-Qaeda-affiliated terrorists killed Christopher Stevens, the U.S. ambassador to Libya, and...