WASHINGTON — 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, according to people familiar with the matter. Flynn's FBI interview on Jan. 24, 2017, set in motion an extraordinary sequence of events unparalleled for the first year of a U.S. presidency. Flynn was fired as national security adviser after 24 days on the job, the acting attorney general was fired 10 days...