Russiagate’s latest celebrity is a former Donald Trump associate named Carter Page. Page, who worked for Merrill Lynch in Moscow and speaks Russian, is a banker and investor who early in 2016 was a part of the amorphous group that was advising Trump on foreign policy. There is no evidence to suggest that he was ever an insider with the Trump campaign—quite the contrary. The Washington Post reports that he made several efforts to meet directly with Donald Trump but that his entreaties were rejected. So why the fuss? Page appears to have been a target of Russian intelligence for...