Last week, House Speaker Nancy Pelosi, D-Calif., falsely labeled Attorney General William Barr a “liar.” Our colleague and former Supreme Court litigator Paul Larkin debunked that baseless epithet, as did Harvard Law School Professor Jack Goldsmith and Kim Strassel of the Wall Street Journal. Now House Democrats are threatening to hold Barr in contempt of Congress because he hasn’t turned over the entire Mueller report, even though he released 92 percent of the entire report to the public and more than 98 percent to Congress. What’s the 2 percent not available to congressional leaders? Grand jury information governed by Federal...