United States v. Michael T. Flynn (1:17-cr-232 EGS) was a federal criminal case against Michael Flynn, former National Security Advisor to Donald Trump. Flynn pleaded guilty on December 1, 2017, to one count of making false statements (18 U.S.C. § 1001) to the FBI during a January 24, 2017, interview about his December 2016 conversations with Russian Ambassador Sergey Kislyak. Specifically, Flynn lied about asking Kislyak to moderate Russia's response to Obama administration sanctions (imposed December 29, 2016, via Executive Order 13757 for election interference) and about urging countries on a UN Security Council resolution on Israeli settlements (voted December 23, 2016). Flynn admitted the lies impeded an FBI counterintelligence probe later assumed by Special Counsel Robert Mueller. Sentencing was set for December 18, 2018, but delayed amid his cooperation. Flynn withdrew his guilty plea in 2020, alleging Brady violations. The Department of Justice, under Attorney General William Barr, moved to dismiss the case on May 7, 2020, claiming lack of materiality, sparking controversy and legal challenges. Judge Emmet Sullivan scrutinized the motion under Rule 48(a); the D.C. Circuit granted mandamus on June 24, 2020, ordering dismissal. President Trump pardoned Flynn on November 25, 2020; the case was dismissed on December 8, 2020, without a conviction. The case was significant for the Mueller Russia probe, exposing transition contacts with Russia, and the controversy over its politicized dismissal and pardon.