As former top FBI official Peter Strzok faces congressional requests to testify, it’s worth examining who he is. Strzok is the subject of what I see as one of the most damaging conclusions in the Department of Justice (DOJ) inspector general report: As the nation’s top FBI counterespionage official, he indicated “a willingness to take official action to impact [Donald Trump’s] electoral prospects.” Specifically, while working on the Hillary Clinton classified email investigation in August 2016, Strzok wrote that he and unnamed others would “stop” Trump from getting elected. He shared his intentions with at least one other FBI official,...