Russian President Vladimir Putin delivers a speech in Moscow's Red Square last May. Russian-backed efforts attempting to interfere in U.S. politics appear to be evolving. Yuri Kochetkov/AFP/Getty Images hide caption
Sen. Mark Warner Sen. Mark Warner
Stories About
Sen. Mark Warner
Sens. Mark Warner, D-Va., and Richard Burr, R-N.C., lead the Senate Intelligence Committee, which is investigating Russian meddling in the 2016 presidential election. Tasos Katopodis/AFP/Getty Images hide caption
Mark Warner (from left) of Virginia, the top Democrat on the Senate Intelligence Committee, and Republican Chairman Richard Burr of North Carolina listen to testimony during a March 30 hearing in Washington, D.C. Win McNamee/Getty Images hide caption
Senate Select Intelligence Committee Chairman Sen. Richard Burr, right, confers with ranking member Sen. Mark Warner, left, during a hearing of the Senate Select Intelligence Committee Thursday in Washington, D.C. Win McNamee/Getty Images hide caption
Director of the National Intelligence James Clapper, seated at the table meets with the Senate Intelligence Committee Feb. 9, including Chairman Richard Burr, R-N.C. Burr and the committee's minority leader, Sen. Dianne Feinstein, D-Calif., are working on a bill that would force companies like Apple to help prosecutors unlock the phones of criminal suspects. Alex Brandon/AP hide caption