KEY POINTS * Dianne Feinstein, the oldest member of the U.S. Senate and the longest-serving senator from California, has died at age 90. * Feinstein’s death leaves vacant her powerful Senate seat, requiring Gov. Gavin Newsom to appoint a temporary successor. * The Democratic senator’s decades-long career was studded with major legislative achievements on issues including gun control and the environment. * Ranking member Dianne Feinstein (D-CA) attends a Senate Judiciary Committee hearing examining issues facing prisons and jails during the coronavirus disease (COVID-19) pandemic on Capitol Hill June 2, 2020 in Washington, D.C. Dianne Feinstein, the oldest member of...