Former U.S. National Security Adviser Michael Flynn departs U.S. District Court after pleading guilty to lying to the FBI about his contacts with Russia's ambassador to the United States, in Washington, U.S., December 1, 2017. REUTERS/Jonathan Ernst
Former US national security adviser Michael Flynn departs a district court after pleading guilty to lying to the FBI. Reuters

How a former Donald Trump aide has further exposed the faultlines in US politics