Gowdy’s fire truck pulled into Fox News Tuesday night for an interview by Martha MacCallum. An able lawyer, the congressman is suddenly on a mission to protect the Justice Department and the FBI from further criticism. So, when Ms. MacCallum posed the question about FBI spying on the Trump campaign, Gowdy deftly changed the subject: Rather than address the campaign, he repeatedly insisted that Donald Trump personally was never the “target” of the FBI’s investigation. The only “target,” Gowdy maintains, was Russia. This is a dodge on at least two levels. First, to repeat, the question raised by the FBI’s...