(Andrew Harnik | The Associated Press) Sen. Amy Klobuchar, D-Minn., speaks next to a poster depicting an online ad that attempted to suppress voters as Facebook's General Counsel Colin Stretch, Twitter's Acting General Counsel Sean Edgett, and Google's Law Enforcement and Information Security Director Richard Salgado, testifies before a Senate Committee on the Judiciary, Subcommittee on Crime and Terrorism hearing on Capitol Hill in Washington, Tuesday, Oct. 31, 2017, on more signs from tech companies of Russian election activity.