Litigation brought by a key figure in the Russiagate scandal has quietly reached the Supreme Court, giving the nation’s nine justices a chance to weigh in on an investigation that has become a symbol of law-enforcement and intelligence abuses during the Obama-Biden era. Carter Page, an energy consultant who briefly served as a foreign policy adviser to President Donald Trump’s 2016 campaign, became the subject of an FBI counterintelligence investigation into possible Russian election interference known as Crossfire Hurricane. In 2020, Page filed a federal lawsuit seeking damages from then-FBI Director James Comey and other former officials, including former Deputy...