A year ago today, President Donald Trump's newly sworn-in national security adviser, Michael Flynn, met privately in his West Wing office with FBI investigators interested in his communications with Russia's ambassador, without a lawyer or the knowledge of the president and other top White House officials. Flynn's FBI interview on Jan. 24, 2017, set in motion an extraordinary sequence of events. Flynn was fired as national security adviser after 24 days on the job, the acting attorney general was fired 10 days after the president took office, the FBI director was allegedly pressured by the president to let go of an investigation into Flynn, and then eventually fired himself. The attorney general recused himself from a federal investigation into Russia's meddling in the 2016 U.S. election and possible collusion with the sitting president's campaign, and a special counsel was appointed. The developments ensnared the president in an obstruction of justice inquiry. By the end of 2017, special counsel Robert Mueller's team had spoken with Director of National Intelligence Dan Coats; Mike Rogers, the director of the National Security Agency; former FBI Director James Comey; and numerous members of Trump's campaign and White House inner circle. Flynn pleaded guilty last month to lying to the FBI. For Trump opponents, his war with the FBI is an effort to undermine the Russia investigation. For Trump and his allies, he's battling a conspiracy within the top ranks of the Justice Department to undermine his presidency.