‘Number one about Cheryl Mills, she is one of the smartest people with the highest standards of integrity that I met at the White House,” says Lanny Davis, the former special counsel to President Clinton, “which is a statement, because there were a lot of smart and a lot of honest people there.” Wednesday’s House Oversight Committee hearing on the Benghazi attack and its aftermath centered unexpectedly on Mills, former secretary of state Hillary Clinton’s counselor and chief of staff. She is also one of the longest serving, most trusted, and most unflinching members of the former first couple’s inner...